对一个对象进行操作的时, 我们真正的操作的是对对象的引用.所以倘若"将一个对象赋值给另一个对象,
实际是将"引用"从一个地方复制到另一个地方
public class Assignment {
public static void main(String[] args) {
Tank t1 = new Tank();
Tank t2 = new Tank();
t1.level = 5;
t2.level = 47;
System.out.println("1: t1.level: " + t1.level + ", t2.level: "
+ t2.level);
t1 = t2;
System.out.println("2: t1.level: " + t1.level + ", t2.level: "
+ t2.level);
t1.level = 27;
System.out.println("3: t1.level: " + t1.level + ", t2.level: "
+ t2.level);
}
}
class Tank {
int level;
}
运行结果:
1: t1.level: 5, t2.level: 47
2: t1.level: 47, t2.level: 47
3: t1.level: 27, t2.level: 27