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Java将数组转换为Set的方法

在本节中，我们将向展示如何将字符串数组转换为Set。可以通过以下方法使用实现：

  • For-each循环
  • Arrays.asList()方法(array⇒list⇒set)
  • Collections.addAll()方法

文件：ArrayToSetExample.java -

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import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

public class ArrayToSetExample {
    public static void main(String[] args) {

        /* Array  to be converted */
        String[] numbers=new String[]{"One""Two""Three""One""Six"};

        /* Method - 1 */
        Set<String> numberList1=new HashSet<>();
        for (String integer : numbers) {
            numberList1.add(integer);
        }
        System.out.println("Number List1="+numberList1);

        /* Method - 2 */
        Set<String> numberList2=new HashSet<>(Arrays.asList(numbers));
        System.out.println("Number List2="+numberList2);

        /* Method - 3 */
        Set<String> numberList3=new HashSet<>();
        Collections.addAll(numberList3 numbers);
        System.out.println("Number List3="+numberList3);
    }
}

执行得到以下结果 -

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Number List1=[Six One Two Three]
Number List2=[Six One Two Three]
Number List3=[Six One Two Three]