class kk{
public int a=1;
public static int b=5;
}
public class k{
public static void main(String args[]){
kk c=new kk();
kk d=new kk();
d.a=d.a+1;
d.b=d.b+5;
c.a=c.a+1;
c.b=c.b+5;
System.out.println("d.a=:"+d.a+ "d.b=:"+d.b);
System.out.println("c.a=:"+c.a +"c.b=:"+c.b);
}} 解析下这个输出结果 为什么?