判斷字元串是否在清單集合中存在
用含有方法,傳回true和false
若存在,傳回true;若不存在,則傳回false;
package com.jianhu.Test;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
public class Test01 {
public static void main(String[] args) {
List list = new ArrayList();
list.add("12");
list.add("35");
list.add("46");
boolean bool = list.contains("12");
boolean bool2 = list.contains("41");
System.out.println(bool);//true
System.out.println(bool2);//false
}
}
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsICM38CXlZHbvN3cpR2Lc1TPB10QGtWUCpEMJ9CXsxWam9CXwADNvwVZ6l2c052bm9CXUJDT1wkNhVzLcRnbvZ2Lc1TPB1ENJRUT1kkaNBDOsJGcohVYsR2MMBjVtJWd0ckW65UbM5WOHJWa5kHT20ESjBjUIF2LcRHelR3LcJzLctmch1mclRXY39TNxYTMzQTNxEzNygDM4EDMy8CX0Vmbu4GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.jpg)