该方法包含（obj o）在Java中做什么？
java.util的contains(Object)方法。如果此列表包含指定的元素，则ArrayList类返回true。
示例
import java.util.ArrayList;
public class ArrayListDemo {
public static void main(String[] args) {
ArrayList<Integer> arrlist = new ArrayList<Integer<(8);
arrlist.add(20);
arrlist.add(25);
arrlist.add(10);
arrlist.add(15);
for (Integer number : arrlist) {
System.out.println("Number = " + number);
}
boolean retval = arrlist.contains(10);
if (retval == true) {
System.out.println("element 10 is contained in the list");
} else {
System.out.println("element 10 is not contained in the list");
}
boolean retval2 = arrlist.contains(30);
if (retval2 == true) {
System.out.println("element 30 is contained in the list");
} else {
System.out.println("element 30 is not contained in the list");
}
}
}输出结果
Number = 20 Number = 25 Number = 10 Number = 15 element 10 is contained in the list element 30 is not contained in the list
热门推荐
10 伴娘祝福语浪漫的话简短
11 伴娘伴郎婚礼祝福语简短
12 学生元旦快乐祝福语简短
13 熊孩子结婚祝福语简短
14 班级老师离别祝福语简短
15 升职英文简短祝福语大全
16 年会老师的祝福语简短
17 传统婚礼祝福语英语简短
18 唐志中爸爸生日祝福语简短