[英]Search through an array for a certain String
在verifyPlate方法中,如何在Plates數組中搜索某個字符串“ platenum”,然后將布爾值返回給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;
}
您只需要1行:
return Arrays.asList(plates).contains(platenum);
如果板是列表而不是數組,則可以省略對asList的調用。 通常,應避免使用數組
您的方法行不通,因為可以在循環的下一次迭代之后重置real
變量。 嘗試以下方法:
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;
}
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