java 去除重复元素

Set特性里面不允许重复元素，所以去除重复元素首选set

@Test
    public void aa(){
    	String testArr1="123;456;789;123;234;";
    	String[] testArr=testArr1.split(";");
        System.out.println(Arrays.toString(testArr));   //Arrays.toString数组转换成String类型输出
        Set set = new TreeSet();
        for (String i : testArr) {
            set.add(i);
        }
        String[] arr2 = set.toArray(new String[0]);//set.toArray 作用将String类型数据转换为String数组
        String[] result = new String[arr2.length];
        for (int i = 0; i < result.length; i++) {
            result[i] = arr2[i];
        }
        System.out.println( Arrays.toString(arr2));
    }

运行结果: