String s1="abc"+"def";

String s2=new String(s1);

If(s1==s2)

System.out.println("==succeeded");

If(s1.equals(s2))

System.out.println(".equals( secceeded");

int x=0;

int y=3;

Switch(y)（

case 1:x++;

case 2:x++;x++;

case 3:x++;x++;x+＋i

case 4:x+=4;

Public class Test implements Runnable{

Public static void main(String args[]){

Test t=new Test();

Thread tt=new Thread(t);

Tt.start();

}

public void run(){

For(;;)

{try{（） ;

}catch(（） e){}

System.out.println(“Hello”);

} }

}

Public class ko10_1 extends Thread {

Int n;

Ko10_1() {

Thread td=new Thread(this);

Td.start(); }

Public void run() {

For (n=0;n<6;n++) {

Try { System.out.print(n);

Thread.sleep(500); }

catch(InterruptedException e) {

System.out.println(“Exception”); } } }

public static void main(String args[]) {

new ko10_1();

} }