java向方法传递对象参数问题？为什么？

Z时代
2024-01-10
分类：技术分享

入坑小白，自学时遇到问题求大神解答！！！！！

public class Test1 {
public static void main(String[] args) {
Circle circle1 = new Circle(1);
Circle circle2 = new Circle(2);
swap1(circle1, circle2);
System.out.println("After swap1: circlel = " + circle1.radius + " circle2 = " + circle2.radius);
swap2(circle1, circle2);
System.out.println("After swap2: circlel = " + circle1.radius + " circle2 = " + circle2.radius);
}
public static void swap1(Circle x, Circle y) {
Circle temp = x;
x = y;
y = temp; }
public static void swap2(Circle x, Circle y){
double temp = x.radius;
x.radius = y.radius;
y.radius = temp;
}
}
class Circle {
double radius;
Circle(double newRadius) {
radius = newRadius;
}
}