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; public Student() { } public Student(String name, int id) { this.name = name; this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getId() { return id; } public void setId(int id) { this.id = id; } }
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 232 45 232 4444 ------------数字类型数组clone-------------- true true 23432 6666 23432 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
原文地址:https://www.cnblogs.com/zhuanjiao/p/11874784.html
时间: 2024-10-14 00:56:51