第一题

package test;

public class hhh {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a=1,b=2,c;
        c=a;
        a=b;
        b=c;
        System.out.println("a="+a);
        System.out.println("b="+b);

        

    }

}