Arrays.copyOf

package test;

import java.util.Arrays;

public class Quess0222 {
public static void main(String[] args) {
Dog[] a = new Dog[2];
a[0] = new Dog("01", "黑色");
a[1] = new Dog("02", "白色");
// Dog[] b = Arrays.copyOf(a, a.length);
Dog[] b=new Dog[2];
// System.arraycopy(a,b,a.length);
System.arraycopy(a, 0, b, 0, a.length);


// 修改dogs02中第二只狗颜色
b[1].setColor("棕色");
//a[1].setColor("白色");



// 打印dogs01中狗的颜色
for (int i = 0; i < a.length; i++) {
System.out.println(a[i]);
}
for (int i = 0; i < b.length; i++) {
System.out.println(b[i]);
}
}
}

class Dog {
private String id;
private String color;

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public String getColor() {
return color;
}

public void setColor(String color) {
this.color = color;
}

public Dog(String id, String color) {
super();
this.id = id;
this.color = color;
}

@Override
public String toString(){
return "编号："+id+", 颜色："+color;
}
}

控制台输出：

编号：01, 颜色：黑色
编号：02, 颜色：棕色
编号：01, 颜色：黑色
编号：02, 颜色：棕色