//数组拷贝
public class Test {public static void main(String[] args) {String[] s = {"Microsoft", "IBM", "Sun", "Oracle", "Apple"};String[] sCopy  = new String[6];System.arraycopy(s, 0, sCopy, 0, s.length);for(int i = 0; i < s.length; i++) {System.out.print(s[i] + " ");}System.out.println();for(int i = 0; i < sCopy.length; i++) {System.out.print(sCopy[i] + " ");}System.out.println();int [][] intArray = {{1, 2}, {1, 3, 4}, {4, 9}};int [][] intArrayCopy = new int [3][];System.arraycopy(intArray, 0, intArrayCopy, 0,intArray.length);//有趣的问题从这里开始intArrayCopy[2][1] = 100;for(int i = 0; i < intArray.length; i++) {for(int j = 0; j < intArray[i].length; j++) {System.out.print(intArray[i][j] + " ");}System.out.println();}//浅层复制问题！}
}

-----------------------------------------------------------------第二个版本，  对上面版本的一点点优化-----------------------------------------

public class TestArrayCopy {public static void main(String[] args) {String[] s = { "Microsoft", "IBM", "Sun", "Oracle", "Apple" };String[] sCopy = new String[6];System.arraycopy(s, 0, sCopy, 0, s.length);for (int i = 0; i < s.length; i++) {System.out.print(s[i] + " ");}System.out.println();for (int i = 0; i < sCopy.length; i++) {System.out.print(sCopy[i] + " ");}System.out.println();int[][] intArray = { { 1, 2 }, { 3, 4, 5 }, { 6, 7 } };int[][] intArrayCopy = new int[3][];System.arraycopy(intArray, 0, intArrayCopy, 0, intArray.length);/*** 用arraycopy会带来潜在的，浅层复制的问题！*/intArray[2][1] = 100;for(int i = 0; i < intArray.length;i++) {for(int j = 0; j < intArray[i].length;j ++) {System.out.print(intArray[i][j] + " ");}System.out.println();}System.out.println();for(int i = 0; i < intArrayCopy.length;i++) {for(int j = 0; j < intArrayCopy[i].length;j ++) {System.out.print(intArrayCopy[i][j] + " ");}System.out.println();}}
}