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public class Z extends Thread{

char[] letters = new char[]{'a','b','c','d','e','f','g','h','i','j','k'

,'l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};

public static void main(String[] args){

Z z = new Z();

X x = new X();

x.start();

z.start();

}

public void run() {

for(int i = 0;i

System.out.println("letter:"+this.letters[i]);

if(i%2!=0){

try {

this.sleep(500);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

}

class X extends Thread{

int[] nums = new int[26];

public X(){

for(int i=0;i

this.nums[i] = i+1;

}

}

public void run() {

for(int i = 0;i

System.out.println("num:"+this.nums[i]);

if(i%2!=0){

try {

this.sleep(500);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

}