java数组常用方法

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以下总结了java数组常用的10个方法!
package com.dxc.collection;import org.apache.commons.lang3.ArrayUtils;import org.apache.commons.lang3.StringUtils;import java.util.ArrayList;import java.util.Arrays;import java.util.HashSet;import java.util.Set;/** * Created by duanxiangchao on 2015/9/9. */public class ArrayDemo {    public static void main(String[] str){        //  1. 数组的声明、初始化        //定义时指定数组的大小（推荐）        String [] aArray = new String[5];        //定义时直接初始化        String [] bArray = {"a","b","c","e","f"};        String [] cArray = new String[]{"a","b","c","e","f"};        //  2. 使用Arrays.toString(Collection)方法可以数组转变为String        int [] intArray = new int[]{1,2,3,4,5};        String intArrayStr = Arrays.toString(intArray);        System.out.println(intArray.toString());        System.out.println(intArrayStr);                //  3. 判断数组是否包含某个值        boolean contain = Arrays.asList(bArray).contains("a");        System.out.println(contain);        //  4. 用指定的字符串链接数组        String join = StringUtils.join(new String[]{"a", "b", "c", "d", "e"}, ";");        System.out.println(join);   //结果 a;b;c;e;f                //  5. 合并两个数组        int [] intArray1 = {1,2,3,4,5};        int [] intArray2 = {6,7,8,9,10};        //Apache commons lang 库        int [] combinedArray = ArrayUtils.addAll(intArray1, intArray2);        System.out.println(combinedArray);                //  6. 数组的反转        int [] arr = {1, 2, 3, 4, 5};        ArrayUtils.reverse(arr);        System.out.println(Arrays.toString(arr));                //  7. 移除元素，会创建新的数组        int [] moveArray = new int[]{1,2,3,4,5,6,7,8,9,10};        int [] removeArray = ArrayUtils.remove(moveArray, 5);  //参数为 数组和索引        System.out.println(Arrays.toString(removeArray));        //  8. 根据数组创建ArrayList        String [] array =  {"a","b","c","e","f"};        ArrayList<String> arrayList = new ArrayList<String>(Arrays.asList(array));        System.out.println(arrayList);        //  9. 将ArrayList转换为数组        Object [] objArray =  arrayList.toArray();        System.out.println("ArrayList转数组：" + Arrays.toString(objArray));        //  10. 将数组转化为Set        Set<String> set = new HashSet<String>(Arrays.asList(bArray ));        System.out.println("数组转化Set: " + set);            }}
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