如何在Java中交换或交换对象？
Java在将参数传递给函数时使用按值调用。要交换对象，我们需要使用它们的包装器。请参阅下面的示例-
示例
public class Tester{
public static void main(String[] args) {
A a = new A();
A b = new A();
a.value = 1;
b.value = 2;
//使用对象交换
swap(a,b);
System.out.println(a.value +", " + b.value);
Wrapper wA = new Wrapper(a);
Wrapper wB = new Wrapper(b);
//使用对象包装器进行交换
swap(wA,wB);
System.out.println(wA.a.value +", " + wB.a.value);
}
public static void swap(A a, A b){
A temp = a;
a = b;
b = temp;
}
public static void swap(Wrapper wA, Wrapper wB){
A temp = wA.a;
wA.a = wB.a;
wB.a = temp;
}
}
class A {
public int value;
}
class Wrapper {
A a;
Wrapper(A a){ this.a = a;}
}输出结果
1, 2 2, 1