22 数组的常用方法

package com.hikvision.java.array;


import java.util.ArrayList;
import java.util.Arrays;

/**
关于数组的常用处理方法
 */
public class ArrayUtils {
    public static void main(String[] args) {
        initArray();
        System.out.println("--------------------------------");
        int [] intArray = { 1, 2, 3, 4, 5 };
        printArray(intArray);
        System.out.println("--------------------------------");
        String[] cArray=new String[]{"a","b","c","d","e"};
        arrayToArrayList(cArray);
        System.out.println("--------------------------------");
        cArray=new String[]{"a","b","c","d","e"};
        String contain="a";
        checkArrayContainValue(cArray,contain);
    }
    /*
    声明初始化一个数据
     */
    public static void initArray(){
        String[] aArray=new String[5];
        String[] bArray={"a","b","c","d","e"};
        String[] cArray=new String[]{"a","b","c","d","e"};
        System.out.println(Arrays.asList(aArray));
        System.out.println(Arrays.asList(bArray));
        System.out.println(cArray);
    }

    /**
     * 在Java中输出一个数组
     * @param array
     */
    public static void printArray(int [] array){
        System.out.println(array);
        String arrayString=Arrays.toString(array);
        System.out.println(arrayString);
    }

    /**
     * 从数组中创建数组列表
     * @param array
     */
    public static void arrayToArrayList(String[] array){
        ArrayList<String> arrayList=new ArrayList<>(Arrays.asList(array));
        System.out.println(arrayList);
    }

    /**
     * 检查数据中是否包含某个值
     * @param array
     * @param value
     */
    public static void checkArrayContainValue(String[] array,String value){
        Boolean isContain=Arrays.asList(array).contains(value);
        System.out.println(isContain);
    }



//    4. 连接两个数组( Concatenate two arrays)
//
//    int[] intArray = { 1, 2, 3, 4, 5 };
//    int[] intArray2 = { 6, 7, 8, 9, 10 };
//    // Apache Commons Lang library
//    int[] combinedIntArray = ArrayUtils.addAll(intArray, intArray2);
//
//    5. 声明一个数组内链(Declare an array inline )
//
//    method(new String[]{"a", "b", "c", "d", "e"});
//
//    6. 将数组元素加入到一个独立的字符串中(Joins the elements of the provided array into a single String)
//
//    // containing the provided list of elements
//// Apache common lang
//    String j = StringUtils.join(new String[] { "a", "b", "c" }, ", ");
//    System.out.println(j);
//// a, b, c
//
//    7. 将数组列表转换成一个数组 (Covnert an ArrayList to an array)
//
//    String[] stringArray = { "a", "b", "c", "d", "e" };
//    ArrayList<String> arrayList = new ArrayList<String>(Arrays.asList(stringArray));
//    String[] stringArr = new String[arrayList.size()];
//    arrayList.toArray(stringArr);
//    for (String s : stringArr)
//            System.out.println(s);
//
//    8. 将数组转换成一个集合(Convert an array to a set)
//
//    Set<String> set = new HashSet<String>(Arrays.asList(stringArray));
//    System.out.println(set);
////[d, e, b, c, a]
//
//    9. 反向数组(Reverse an array)
//
//    int[] intArray = { 1, 2, 3, 4, 5 };
//    ArrayUtils.reverse(intArray);
//    System.out.println(Arrays.toString(intArray));
////[5, 4, 3, 2, 1]
//
//    10. 删除数组元素(Remove element of an array)
//
//    int[] intArray = { 1, 2, 3, 4, 5 };
//    int[] removed = ArrayUtils.removeElement(intArray, 3);//create a new array
//    System.out.println(Arrays.toString(removed));
}

 

posted @ 2016-10-31 18:58  life_start  阅读(202)  评论(0编辑  收藏  举报