java list的六种赋值方式

public static void main(String[] args) {

//第一种赋值

List list1 = Arrays.asList("string1","string2","string3");

//第二种赋值

List list2 = new ArrayList<>();

list2.add("string4");

list2.add("string5");

list2.add("string6");

//第三种赋值

list2.addAll(list1);

//第四种赋值

List list3 = new ArrayList<>();

Collections.addAll(list3, "string7","string8","string9");

//第五种赋值

List list4 = new ArrayList(){{

add("string10");

add("string11");

add("string12");

//第六种赋值

addAll(list1);

}};

System.out.println(list1);

System.out.println(list2);

System.out.println(list3);

System.out.println(list4);

}

/*output

[string1, string2, string3]

[string4, string5, string6, string1, string2, string3]

[string7, string8, string9]

[string10, string11, string12, string1, string2, string3]

*/

posted @

2022-10-11 11:57

chelsey3tsf

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