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‎A.java

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/*
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Anonymous Inner class example:-
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*/
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package javapep;
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/**
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*
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* @author anil
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*/
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public interface A {//cannot create objects of interface
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void meth();
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}
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interface B
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{
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void meth1();
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}
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abstract class C{
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abstract void meth2();
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void meth3()
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{
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System.out.println("hello meth3 abstract");
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}
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}
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class test
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{
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public static void main(String args[])
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{
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A ob = new A()//Anonymous in a class it is only making a reference of interface A not creating object of A
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{
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public void meth()
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{
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System.out.println("Anonymous implementation");
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}
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};
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B ob1 = new B()//Anonymous in a class it is only making a reference of interface A not creating object of A
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{
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public void meth1()
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{
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System.out.println("Anonymous implementation in Interface B");
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}
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};
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B o2=()->{//lamba implementation it can be implemented with function interface only
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//And function interface can only hold one methode
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System.out.println("Lambda expressions");
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};
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o2.meth1();
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test ob2 = new test(){
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void meth2()
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{
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System.out.println("Abstract implementation");
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}
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};
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ob.meth();
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ob1.meth1();
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//ob2.meth2();
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}
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}
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‎Arraylist.java

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/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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package javapep;
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import java.util.ArrayList;
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import java.util.Iterator;
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/**
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*
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* @author anil
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*/
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public class Arraylist {
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int nPage;
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String author;
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int edition;
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Arraylist(int n,String author ,int edition)
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{
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this.author=author;
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this.nPage=n;
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this.edition=edition;
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}
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}
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class demo{
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static int display( ArrayList<Arraylist> al)
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{
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System.out.println("nPage"+" "+"author"+" " +"edition");
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Arraylist b;
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Iterator it =al.iterator();
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while(it.hasNext())
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{
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b=(Arraylist)it.next();
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System.out.println(b.nPage+" "+b.author+" "+b.edition);
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//System.out.println(al);
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}
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return 0;
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}
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public static void main(String args[])
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{
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// ArrayList<String> al= new ArrayList<>();
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// al.add("Anil");
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// al.add("Vivek");
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// al.add("Pankaj");
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// al.add("Arvind");
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// System.out.println(al);
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// Iterator it =al.iterator();
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// while(it.hasNext())
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// System.out.print(it.next());
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// if(al.contains("anil"))
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// {
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// System.out.println("yes");
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// }
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// else
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// {
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// System.out.println("NO");
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// }
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// for(String a:al)
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// System.out.print(a);
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// for(int i=0;i<al.size();i++)
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// {
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// System.out.print(al.get(i));
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// }
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Arraylist a=new Arraylist(50,"anil",1997);
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Arraylist b=new Arraylist(51,"pankaj",1998);
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Arraylist c=new Arraylist(52,"deepak",1999);
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ArrayList<Arraylist> al= new ArrayList<Arraylist>(); //Generic type arraylist
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al.add(a);
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al.add(b);
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al.add(c);
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display(al);
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}
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}
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‎BubbleSort.java

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/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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package javapep;
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/**
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*
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* @author anil
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*/
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public class BubbleSort {
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public static void main(String args[])
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{
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int arr[]={5,7,4,9,3,2,1};
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int temp;
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for(int i=0;i<7;i++)
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{
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for(int j=0;j<7-i-1;j++)
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{
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if(arr[j]>arr[j+1])
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{
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temp=arr[j];
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arr[j]=arr[j+1];
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arr[j+1]=temp;
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}
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}
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}
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for(int j=0;j<arr.length;j++)
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{
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System.out.println(arr[j]);
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}
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}
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}
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‎ChangeCaseWithString.java

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/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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package javapep;
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/**
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*
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* @author anil
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*/
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public class ChangeCaseWithString {
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public static void main(String args[])
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{
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String s1="tHis IS aN EXamPLE";
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char ar[]=new char[s1.length()];
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ar=s1.toCharArray();
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for(int i=0;i<ar.length;i++)
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{
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if(Character.isUpperCase(ar[i]))
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{
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ar[i]=Character.toLowerCase(ar[i]);
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}
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else if(Character.isLowerCase(ar[i]))
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{
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ar[i]=Character.toUpperCase(ar[i]);
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}
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}
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String se=new String(ar);
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System.out.println(se);
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}
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}
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‎DateTime.java

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/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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package javapep;
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import java.time.*;
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import java.time.format.DateTimeFormatter;
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import java.time.temporal.ChronoUnit;
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import java.util.Date;
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/**
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*
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* @author anil
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*/
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public class DateTime {
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public static void main(String args[])
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{
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// LocalDate ld=LocalDate.now();
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// System.out.println(ld);
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// LocalTime lt=LocalTime.now();
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// System.out.println(lt);
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//
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// LocalDateTime ldt =LocalDateTime.now();
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// System.out.println(ldt);
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//
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// LocalDate ld1= LocalDate.of(2019,Month.JULY,13);
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// System.out.println(ld1);
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//
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// LocalDate ld2=ld1.plusDays(3);
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// System.out.println(ld2);
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//
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// LocalDate ld5=ld1.minusDays(3);
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// System.out.println(ld5);
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//
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// System.out.println(ld2.getDayOfMonth());
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// System.out.println(ld2.getDayOfWeek());
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// System.out.println(ld1.isAfter(ld2));
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//
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// LocalDate ld3=LocalDate.parse("2016-05-30");
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// System.out.println(ld3);
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//
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// System.out.println(ld3.isLeapYear());
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//
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// DateTimeFormatter dtf= DateTimeFormatter.ofPattern("dd-MM-yyyy,HH:mm:ss");
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// String s=ldt.format(dtf);
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// System.out.println(s);
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Period p=Period.ofDays(10);
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System.out.println(p);
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LocalTime lt1=LocalTime.now();
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LocalTime lt2=lt1.plusHours(5);
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Duration d=Duration.between(lt1,lt2);
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System.out.println(d.get(ChronoUnit.SECONDS));
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System.out.println(d.toHours());//check hours between lt1 n lt2
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System.out.println(d.toMinutes());
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}
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}

‎ExcepArray.java

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/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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package javapep;
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class ExcepArray extends Exception
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{
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ExcepArray(String s)
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{
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super(s);
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}
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}
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class t{
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public static void main(String args[]) throws ExcepArray
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{
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int arr1[]={1,5,7,8,9,10};
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int arr2[]={1,5,7,8,9};
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try
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{
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int sum1=0;
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if(arr1.length==arr2.length)
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{
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for(int i=0;i<arr1.length;i++)
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{
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sum1=sum1+arr1[i]+arr2[i];
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}
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System.out.println("sumof two arrays ="+sum1);
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}
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else{
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throw new ExcepArray("Not same size");
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}
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}catch(Exception e)
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{
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System.out.println("Exception occured: "+e.getMessage());
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}
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}
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}
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