Java Threads Programs

ThreadDemo1.java
class A extends Thread{
    public void run(){
        for(int i=0;i<10;i++){
            try{Thread.sleep(500);}catch(Exception e){}
            System.out.println(i+"  A");
        }
    }
}

class B extends Thread{
    public void run(){
        for(int i=0;i<10;i++){
            try{Thread.sleep(500);}catch(Exception e){}
            System.out.println(i+"  B");
        }
    }
}
class ThreadDemo1 {
    public static void main(String ar[]){
        //java.io.Console c=System.console();
        //String s=c.readLine("Hello Enter something ");
        A a1=new A();
        B b1=new B();
        a1.start();
        b1.start();
        try{Thread.sleep(5500);}catch(Exception e){}
        a1.start();
        System.out.println("Finished");
    }
}
ThreadDemo2.java
class A implements Runnable{
    public void run(){
        for(int i=0;i<10;i++){
            try{Thread.sleep(500);}catch(Exception e){}
            System.out.println(i+"  A");
        }
    }
}

class B implements Runnable{
    public void run(){
        for(int i=0;i<10;i++){
            try{Thread.sleep(500);}catch(Exception e){}
            System.out.println(i+"  B");
        }
    }
}
class ThreadDemo1 {
    public static void main(String ar[]){
        //java.io.Console c=System.console();
        //String s=c.readLine("Hello Enter something ");
        A a1=new A();
        B b1=new B();
        
        Thread t1=new Thread(a1);
        Thread t2=new Thread(b1);
        
        t1.start();
        t2.start();
        System.out.println("Finished");
    }
}
ThreadDemo3.java
class ThreadDemo3 {
    public static void main(String ar[]){
        Thread t=Thread.currentThread();
        System.out.println(t);
        t.setName("MyThread");
        System.out.println(t.getName());
        t.setPriority(7);
        System.out.println(t.getPriority());
    }
}
ThreadDemo4.java
class A implements Runnable{
    public void run(){
        for(int i=0;i<100000;i++){
            //try{Thread.sleep(500);}catch(Exception e){}
            System.out.println(i+"  A "+Thread.currentThread().getName());
        }
    }
}

class B implements Runnable{
    public void run(){
        for(int i=0;i<100000;i++){
            Thread t=Thread.currentThread();
            //try{Thread.sleep(500);}catch(Exception e){}
            System.out.println("                        "+i+"B  "+t.getName());
        }
    }
}
class ThreadDemo4 {
    public static void main(String ar[]){
        //java.io.Console c=System.console();
        //String s=c.readLine("Hello Enter something ");
        A a1=new A();
        B b1=new B();
        
        Thread t1=new Thread(a1);
        Thread t2=new Thread(b1);
        t1.setPriority(4);
        t2.setPriority(7);
        t1.setDaemon(true);
        t2.setDaemon(true);
        t1.start();
        t2.start();
        try{Thread.sleep(3000);}catch(Exception e){}
        System.out.println("Finished");
    }
}
ThreadDemo5.java
class A implements Runnable{
    public void run(){
        for(int i=0;i<100000;i++){
            //try{Thread.sleep(500);}catch(Exception e){}
            if(i==100){
                throw new ArithmeticException("Exception thrown");
            }
            System.out.println(i+"  A "+Thread.currentThread().getName());
        }
    }
}

class B implements Runnable{
    public void run(){
        for(int i=0;i<100000;i++){
            Thread t=Thread.currentThread();
        try{    
            if(i==100){
                    throw new ArithmeticException("Exception thrown");

                }
            }catch(ArithmeticException e){System.out.println("hi");}
            
            //try{Thread.sleep(500);}catch(Exception e){}
            System.out.println("                        "+i+"B  "+t.getName());
        }
    }
}

class ThreadDemo4 {
    public static void main(String ar[]){
        //java.io.Console c=System.console();
        //String s=c.readLine("Hello Enter something ");
        A a1=new A();
        B b1=new B();
        
        Thread t1=new Thread(a1);
        Thread t2=new Thread(b1);
        t1.setPriority(4);
        t2.setPriority(7);
        t1.setDaemon(true);
        t2.setDaemon(true);
        t1.start();
        t2.start();
        try{Thread.sleep(3000);}catch(Exception e){}
        System.out.println("Finished");
    }
}
ThreadDemo6.java
class Common{
    synchronized public void m1(){
        System.out.println("Hi");
        try{Thread.sleep(500);}catch(Exception e){}
        System.out.println("Hello");
    }
}
class A implements Runnable{
    Common c1;
    public void run(){
            c1.m1();
        }
    
}

class B implements Runnable{
    Common c2;
    public void run(){
            c2.m1();
        }
    
}

class ThreadDemo4 {
    public static void main(String ar[]){
        A a1=new A();
        B b1=new B();
        Common c=new Common(); 
        a1.c1=c;
        b1.c2=c;
        Thread t1=new Thread(a1);
        Thread t2=new Thread(b1);
        t1.start();
        t2.start();
    }
}
ThreadDemo7.java
class Common{
    public void m1(){
        System.out.println("Hi");
        try{Thread.sleep(500);}catch(Exception e){}
        System.out.println("Hello");
    }
}
class A implements Runnable{
    Common c1;
    public void run(){
        synchronized(c1){
            c1.m1();
        }
    }
}

class B implements Runnable{
    Common c2;
    public void run(){
            synchronized(c2){
                c2.m1();
        }
    }
}

class ThreadDemo7 {
    public static void main(String ar[]){
        A a1=new A();
        B b1=new B();
        Common c=new Common(); 
        a1.c1=c;
        b1.c2=c;
        Thread t1=new Thread(a1);
        Thread t2=new Thread(b1);
        t1.start();
        t2.start();
    }
}