字符串数组(String []) 去掉重复值的方法 原创

字符串数组(String []) 去掉重复值的方法

复制Javapackage com.leixing.blog.test;

import java.util.*;

/**
 * String[]数组去重
 */
public class ArrayAndSet {

    public static void main(String[] args) {
        String[] arr = new String[]{"12","10","18","10","12","10"};
        demo1(arr);
        System.out.println();
        demo2(arr);
    }

    /**
     * String[] 不重复的添加到 List 然后再转回 String[]
     * @param arr
     */
    private static void demo2(String[] arr) {
        ArrayList list = new ArrayList();
        for (int i = 0; i < arr.length; i++) {
            if (!list.contains(arr[i]))
                list.add(arr[i]);
        }
        String[] arr2 = (String[])list.toArray(new String[0]);
        for (int i = 0; i < arr2.length; i++) {
            System.out.print(arr2[i] + "\t");
        }
    }

    /**
     * String[] 转 Set 然后再转回 String[]
     * @param arr
     */
    private static void demo1(String[] arr) {
        List list = Arrays.asList(arr);
        Set set = new HashSet(list);
        String [] arr2=(String [])set.toArray(new String[0]);
        for (int i = 0; i < arr2.length; i++) {
            System.out.print(arr2[i] + "\t");
        }
    }
}
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