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本文为joshua317原创文章,转载请注明：转载自joshua317博客 Java数组拷贝 - joshua317的博客

Java数组的四种拷贝方式

1.for循环实现数组copy

2.clone实现数组copy

3.System.arraycopy()实现数组copy

4.Arrays.copyOf实现数组copy

下面通过下面实现一维数组和二维数组的copy

package com.joshua317;import java.util.*;public class Test {public static void main(String[] args) {String[] namesArr = {"joshua317","joshua","jack"};String[] namesArrCopy1 = new String[namesArr.length];//1.1 一维数组--for循环实现数组copySystem.out.println("==========================一维数组--for循环实现数组copy============================");for (int i=0; i<namesArrCopy1.length; i++) {namesArrCopy1[i] = namesArr[i];}printArr(namesArrCopy1);//1.2 一维数组--clone实现数组copySystem.out.println("==========================一维数组--clone实现数组copy============================");String[] namesArrCopy2 = namesArr.clone();printArr(namesArrCopy2);//1.3 一维数组--System.arraycopy()System.out.println("==========================一维数组--System.arraycopy()============================");String[] namesArrCopy3 = new String[namesArr.length];System.arraycopy(namesArr, 0,namesArrCopy3,0, namesArr.length);printArr(namesArrCopy3);//1.4 一维数组--Arrays.copyOf实现数组copySystem.out.println("==========================一维数组--Arrays.copyOf实现数组copy============================");String[] namesArrCopy4 = Arrays.copyOf(namesArr,namesArr.length);printArr(namesArrCopy4);//2.1 二维数组--for循环实现数组copySystem.out.println("==========================二维数组--for循环实现数组copy============================");String[][] names2Arr = {{"joshua317","joshua","jack"},{"joshua318","joshua2","jack2"}};String[][] names2ArrCopy1 = new String[names2Arr.length][names2Arr[0].length];for (int i = 0; i < names2ArrCopy1.length; i++) {for (int j = 0; j < names2ArrCopy1[i].length; j++) {names2ArrCopy1[i][j] = names2Arr[i][j];}}printArr2(names2ArrCopy1);//2.2 二维数组--clone实现数组copySystem.out.println("==========================二维数组--clone实现数组copy============================");String[][] names2ArrCopy2 = new String[names2Arr.length][names2Arr[0].length];for (int i = 0; i < names2ArrCopy2.length; i++) {names2ArrCopy2[i] = names2Arr[i].clone();}printArr2(names2ArrCopy2);//2.3 二维数组--System.arraycopy()System.out.println("==========================二维数组--System.arraycopy()============================");String[][] names2ArrCopy3 = new String[names2Arr.length][names2Arr[0].length];for (int i = 0; i < names2ArrCopy3.length; i++) {System.arraycopy(names2Arr[i], 0,names2ArrCopy3[i],0, names2Arr[i].length);}printArr2(names2ArrCopy3);//2.4 二维数组--Arrays.copyOf实现数组copySystem.out.println("==========================二维数组--Arrays.copyOf实现数组copy============================");String[][] names2ArrCopy4 = new String[names2Arr.length][names2Arr[0].length];for (int i = 0; i < names2ArrCopy4.length; i++) {names2ArrCopy4[i] = Arrays.copyOf(names2Arr[i],names2Arr[i].length);}printArr2(names2ArrCopy4);}public static <T> void printArr(T[] t){System.out.println(Arrays.toString(t));}public static <T> void printArr2(T[][] t){for (int i=0; i<t.length; i++) {System.out.println(Arrays.toString(t[i]));}}

本文为joshua317原创文章,转载请注明：转载自joshua317博客 Java数组拷贝 - joshua317的博客