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1.利用Set去重

@Test
public void distinctList() {List<String> oldList = new ArrayList<>();oldList.add("a");oldList.add("a");oldList.add("b");oldList.add("c");oldList.add("d");List<String> newList = new ArrayList<>(new HashSet<>(oldList));System.out.println("去重后的List："+newList);
}

2.stream流去重

@Test
public void distinctList() {List<String> oldList = new ArrayList<>();oldList.add("a");oldList.add("a");oldList.add("b");oldList.add("c");oldList.add("d");List<String> newList = oldList.stream().distinct().collect(Collectors.toList());System.out.println("去重后的List："+newList);
}

3.for单循环添加去重

@Test
public void distinctList() {