这篇文章主要介绍了Java 数组复制clone方法实现详解,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
一、源码
public class Test1 {
public static void main(String[] args) {
// Student[] arrs = new Student[] { new Student() { id = "22" } }; C# 可以简写法，Java不支持
Student[] arrs = new Student[1];
Student st = new Student();
st.id = 12;
st.name = "qwe";
arrs[0] = st;
Student[] arRSS = arrs.clone();
System.out.println(arrs == arRSS);
System.out.println(arrs.equals(arRSS));
arRSS[0].id = 56;
for (int i = 0; i < arrs.length; i++) {
System.out.println(arrs[i].id + arrs[i].name);
}
for (int i = 0; i < arRSS.length; i++) {
System.out.println(arRSS[i].id + arRSS[i].name);
}
System.out.println("-------------自定义对象类型数组clone-------------");
Student[] arrst1 = new Student[1];
Student st1 = new Student();
st1.id = 162;
st1.name = "qkkj";
arrst1[0] = st1;
Student[] arrst2 = arrst1;
System.out.println(arrst1 == arrst2);
System.out.println(arrst1.equals(arrst2));
arrst2[0].id = 996;
for (int i = 0; i < arrst1.length; i++) {
System.out.println(arrst1[i].id + arrst1[i].name);
}
for (int i = 0; i < arrst2.length; i++) {
System.out.println(arrst2[i].id + arrst2[i].name);
}
System.out.println("-------------自定义对象类型数组= 赋值-------------");
var arr1 = new String[] { "we","dfeffg" };
var arr = arr1.clone();
System.out.println(arr1 == arr);
System.out.println(arr1.equals(arr));
arr[1] = "ddddddddddddddd";
for (int i = 0; i < arr.length; i++) {
System.out.println(arr[i]);
}
for (int i = 0; i < arr1.length; i++) {
System.out.println(arr1[i]);
}
System.out.println("------------字符串数组clone--------------");
var arr11 = new String[] { "we","dfeffg" };
var arr111 = arr11;
System.out.println(arr111 == arr11);
System.out.println(arr111.equals(arr11));
arr111[1] = "ddddddddddddddd";
for (int i = 0; i < arr11.length; i++) {
System.out.println(arr11[i]);
}
for (int i = 0; i < arr111.length; i++) {
System.out.println(arr111[i]);
}
System.out.println("------------字符串数组=赋值--------------");
var arr2 = new int[] { 232,45 };
var arr3 = arr2.clone();
System.out.println(arr2 == arr3);
System.out.println(arr2.equals(arr3));
arr3[1] = 4444;
for (int i = 0; i < arr2.length; i++) {
System.out.println(arr2[i]);
}
for (int i = 0; i < arr3.length; i++) {
System.out.println(arr3[i]);
}
System.out.println("------------数字类型数组clone--------------");
var arr4 = new int[] { 23432,44455 };
var arr5 = arr4;
System.out.println(arr4 == arr5);
System.out.println(arr4.equals(arr5));
arr4[1] = 6666;
for (int i = 0; i < arr4.length; i++) {
System.out.println(arr4[i]);
}
for (int i = 0; i < arr5.length; i++) {
System.out.println(arr5[i]);
}
System.out.println("------------数字类型数组=赋值-----------------");
}
}
class Student {
public int id;
public String name;
}
二、运行结果
false false 56qwe 56qwe -------------自定义对象类型数组clone------------- true true 996qkkj 996qkkj -------------自定义对象类型数组= 赋值------------- false false we ddddddddddddddd we dfeffg ------------字符串数组clone-------------- true true we ddddddddddddddd we ddddddddddddddd ------------字符串数组=赋值-------------- false false 45 4444 ------------数字类型数组clone-------------- true true 6666 6666 ------------数字类型数组=赋值-----------------
三、结果分析
1.clone复制，对于数组本身而言，它的元素是引用类型（字符串除外）的时候，本来数组每个元素中保存的就是对象的引用，所以，拷贝过来的数组自然而言也是对象的引用，所以对于数组对象元素而言，它又是浅拷贝；
2.clone复制，对于引用类型（字符串除外），改变其中一个中的值，会影响另外一个值，相当于“浅拷贝”；
3.clone复制，对于值类型、字符串，改变其中一个中的值，不会影响另外一个值，相当于“深拷贝”；
4.等号复值后修改一个后会影响另一个
