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/*这是我在网上找这个问题时遇到的代码*/
class Person {
private String name;//姓名
private String sex;//性别
public Person(String x, String y) {
this.name = x;
this.sex = y;
}
public void setStatus(String x, String y) {
this.name = x;
this.sex = y;
}
public String toString() {
return name + sex;
}
// -----交换普通对象-----
public static void changeref(Person tmpx, Person tmpy) {
//交换tmpx和tmpy对象
Person swapref = tmpx;
tmpx = tmpy;
tmpy = swapref;
System.out.println("在方法中交换的结果: refa =" + tmpx.toString());
System.out.println("在方法中交换的结果: refb =" + tmpy.toString());
System.out.println();
}
// ----- 交换数组对象-----
public static void changeArrayRef(Person[] x, Person[] y) {
//交换数组对象
//System.out.println(x);
//System.out.println(x[1]);
Person swaparrayref = x[1];
System.out.println(swaparrayref);
x[1] =y[1];
y[1] = swaparrayref;
}
//-----交换数组-----
public static void changeArray(int[] x,int[] y) {
int[] tmp =x;
x = y;
y = tmp;
}
}
public class Demo {
public static void main(String[] args) {
//-------建立并构造两个对象---------
Person refa = new Person("张三", "男");
Person refb = new Person("李四", "男");
//交换refa对象和refb对象
Person.changeref(refa, refb);
//从交换结果中看出,实际对象并未交换
System.out.println("在主函数中交换的结果 refa = " + refa.toString());
System.out.println("在主函数中交换的结果 refb = " + refb.toString());
//-------建立两个对象数组----------
Person[] arraya = new Person[2];
Person[] arrayb = new Person[2];
//分别构造数组对象
arraya[0] = new Person("王五","男");
arraya[1] = new Person("wo","男");
arrayb[0] = new Person("赵六","男");
arrayb[1] = new Person("ni ","女");
/*数组对象为null时,不能设置其值,必须先构造它(即调用构造函数),再用其它方法设置其值
*/
System.out.println('\n'+"数组对象交换前的结果 arraya = " + arraya[1].toString());
System.out.println("数组对象交换前的结果 arrayb = " + arrayb[1].toString());
//交换这两个数组对象
Person.changeArrayRef(arraya, arrayb);
System.out.println("-交换后的结果 arraya = " + arraya[1].toString());
System.out.println("-交换后的结果 arrayb = " + arrayb[1].toString());
//-------建立两个普通数组---------
int[] a = new int[2];
int[] b = new int[2];
//给数组个元素赋值
for(int i =0;i<a.length;i++){
a[i] = i;
b[i] = i+1;
}
System.out.println('\n'+"数组交换前 inta[0] = " + a[0]);
System.out.println("数组交换前 intb[0] = " + b[0]);
//交换数组
Person.changeArray(a,b);
System.out.println("-交换后的结果 inta[0] = " + a[0]);
System.out.println("-交换后的结果 intb[0] = " + b[0]);
}
}