jdk1.5 Arrays 学习笔记

import java.util.Arrays;public class ArraysTester { private int [] ar; public ArraysTester( int numValues) { ar = new int [numValues]; for ( int i = 0 ;i < ar.length;i ++ ) { ar[i] = ( 1000 - ( 300 + i)); } } public int [] get() { return ar; } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub ArraysTester test = new ArraysTester( 50 ); int [] myArray = test.get(); int [] myOtherArray = test.get().clone(); if (Arrays.equals(myArray, myOtherArray)) { System.out.println( " 相等 " ); } else { System.out.println( " 不相等 " ); } Arrays.fill(myOtherArray, 2 , 10 , new Double(Math.PI).intValue()); myArray[ 30 ] = 98 ; System.out.println( " 这是一个未排序的数组 " ); System.out.println(Arrays.toString(myArray)); Arrays.sort(myArray); System.out.println( " 这是一个排序的数组 " ); System.out.println(Arrays.toString(myArray)); int index = Arrays.binarySearch(myArray, 98 ); System.out.println( " 98被定位在第 " + index + " 个位置上 " ); String[][] ticTacToe = { { " X " , " 0 " , " 0 " } , { " 0 " , " X " , " X " } , { " X " , " 0 " , " X " } } ; System.out.println(Arrays.deepToString(ticTacToe)); String[][] ticTacToe2 = { { " 0 " , " 0 " , " X " } , { " 0 " , " X " , " X " } , { " X " , " 0 " , " X " } } ; String[][] ticTacToe3 = { { " X " , " 0 " , " 0 " } , { " 0 " , " X " , " X " } , { " X " , " 0 " , " X " } } ; if (Arrays.deepEquals(ticTacToe, ticTacToe2)) { System.out.println( " 相等 " ); } else { System.out.println( " 不相等 " ); } if (Arrays.deepEquals(ticTacToe, ticTacToe3)) { System.out.println( " 相等 " ); } else { System.out.println( " 不相等 " ); } }}

结语：

Arrays.equals(myArray, myOtherArray)---直接比较两个数组是否相等
Arrays.fill(a, val)---将数组a中所有元素都用val来填充
Arrays.fill(a, 2,10,val);---将数组a，从索引为2的元素到第10的元素用val来填充
Arrays.sort(a);---按照自然规律排序，升序
Arrays.binarySearch(myArray, 98);---搜索myArray中值为98的索引号，并返回索引
Arrays.toString(a)--打印数组a格式：[2asdf, 3asd, afas]
Arrays.deepToString(ticTacToe)--打印多维数组ticTacToe
Arrays.deepEquals(ticTacToe, ticTacToe2)---比较两个多维数组
List<String> d = Arrays.asList(a);---将数组转换为List