Question

在verifyPlate方法中，如何在数组Plates中搜索某个字符串“platenum”，然后将一个布尔值返回给main方法？

import java.util.Scanner;
import java.util.Date;
import java.io.*;

public static boolean verifyPlate(String[] plates, int numCars, Scanner keyboard)
  {
    Scanner s = new Scanner(System.in);

    System.out.print("Enter your plate number: ");
    String platenum = s.nextLine();

    boolean real=false;

    for (int i=0;i!=plates.length;i++)
    {
       boolean platers = platenum.equals(plates[i]); 

       if(platers)
       {
           System.out.println("Your vehicle is registered");
        }
       else
        System.out.println("Your vehicle is not registered");

     platers=real;
    }

    return real;
}

Answer 1

您只需要一行：

return Arrays.asList(plates).contains(platenum);

如果plate是列表而不是数组，则可以省略对asList的调用。通常，应避免使用数组

Answer 2

您的方法不起作用，因为real变量可以在循环中的下一次迭代后重置。试试这个：

public static boolean verifyPlate(String [] plates, int numCars,
                                                  Scanner keyboard) {
    Scanner s = new Scanner(System.in);

    System.out.print("Enter your plate number: ");
    String platenum = s.nextLine();

    for (int i=0;i!=plates.length;i++){
        boolean platers = platenum.equals(plates[i]); 

       if(platers) {
       System.out.println("Your vehicle is registered");   
       return true;
       }

    }
    System.out.println("Your vehicle is not registered");
    return false;
}

在数组中搜索某个String

2 个答案: