//save by .java only  
    class A{  
    public static void main(String args[]){  
    System.out.println("Hello java");  
    }  
    }  
    //compile by javac .java  
    //run by     java A  

compile it by javac .java

run it by java A 
 

      
    class Test   
    {  
        public static void main (String args[])   
        {  
            System.out.println(10 + 20 + "Javatpoint");   
            System.out.println("Javatpoint" + 10 + 20);  
        }  
    }  

 
 

      
The output of the above code will be

30Javatpoint
Javatpoint1020 
 

      
    class Test   
    {  
        public static void main (String args[])   
        {  
            System.out.println(10 * 20 + "Javatpoint");   
            System.out.println("Javatpoint" + 10 * 20);  
        }  
    }  
 
 

      

The output of the above code will be

200Javatpoint
Javatpoint200
 
 

      
 class Student3{  
    int id;  
    String name;  
      
    void display(){System.out.println(id+" "+name);}  
      
    public static void main(String args[]){  
    Student3 s1=new Student3();  
    Student3 s2=new Student3();  
    s1.display();  
 
 

      

    class Test   
    {  
        int i;   
        public Test(int k)  
        {  
            i=k;  
        }  
        public Test(int k, int m)  
        {  
            System.out.println("Hi I am assigning the value max(k, m) to i");  
           
 

      

    //Program of static variable  
      
    class Student8{  
       int rollno;  
       String name;  
       static String college ="ITS";  
         
       Student8(int r,String n){  
       rollno = r;  
       name = n;  
       }  
     void di 
 

      
 class A2{  
      static{System.out.println("static block is invoked");}  
      public static void main(String args[]){  
       System.out.println("Hello main");  
      }  
    }   
 

      

    abstract class Test  
    {  
        static int i = 102;  
        static void TestMethod()  
        {  
            System.out.println("hi !! I am good !!");  
        }  
    }  
    public class TestClass extends Test   
    {  
        public s 
 

      

    public class Test  
    {  
        public Test()  
        {  
            this = null;   
            System.out.println("Test class constructor called");  
        }  
        public static void main (String args[])  
        {  
            Test  
 

      

    class A{  
    void msg(){System.out.println("Hello");}  
    }  
    class B{  
    void msg(){System.out.println("Welcome");}  
    }  
    class C extends A,B{//suppose if it were  
       
     Public Static void main(String args[]){  
       C o 
 

      
class Animal{  
    Animal(){System.out.println("animal is created");}  
    }  
    class Dog extends Animal{  
    Dog(){  
    System.out.println("dog is created");  
    }  
    }  
    class TestSuper4{  
    public static void main(String args[]){   
 

      
protected Object clone() throws CloneNotSupportedException     
 

      
 class Adder{  
    static int add(int a,int b){return a+b;}  
    static double add(int a,int b){return a+b;}  
    }  
    class TestOverloading3{  
    public static void main(String[] args){  
    System.out.println(Adder.add(11,11));//ambiguity  
    
 

      

    public class Animal  
    {  
        void consume(int a)  
        {  
            System.out.println(a+" consumed!!");  
        }  
        static void consume(int a)  
        {  
            System.out.println("consumed static "+a);  
        }  
 

      
 final class Bike{}  
      
    class Honda1 extends Bike{  
      void run(){System.out.println("running safely with 100kmph");}  
        
      public static void main(String args[]){  
      Honda1 honda= new Honda1();  
      honda.run();  
      }  
 

      
public interface Serializable{    
    }  
 

      
String s1="Welcome";  
    String s2="Welcome";//It doesn't create a new instance   
 

      
    String s = new String("Welcome");