java之使用数组去重复数据

String[] test = new String[]{"123", "113", "222", "333", "123", "123", "123"};
 List<String> list1=new ArrayList<>();
 for (int i = 0; i < test.length; i++) {
            if (!list1.contains(test[i])) {
                list1.add(test[i]);
            }
        }
        System.out.println(JSON.toJSONString(list1));

["123","113","222","333"]

int[] num={2,4,2,6,1,1,2,6,7};
List<Integer> list=new Arraylist<>();
for (int i: num){
    if(!list.contains(i)){
    list. add(i)
    }
}
System. out. printin(list.toString();

[2,4,6,1,7]

Integer [] num1={ 2 , 4 , 5 , 6 ,3,2 , 5 , 6 , 7 };
Set <Integer> set=new Treeset < > ( Arrays.aslist ( num1) ) ;
for ( int i:num1){
    set.add (i);
}
System . out . println ( set.toString ( ) );

[2,4,5,6,3,7]

int[] num2={ 5 , 5 , 6 ,2 , 1,2,9,7 };
Set < Integer > set2=new Treeset < > ( ) ;
for ( int i:num2){
set2.add ( i ) ;
}
System . out . println ( set2.tostring ( ) ) ;

[5,6,2,1,9,7]