Question

有//告诉我需要什么帮助。所以我接受了用户输入，现在我尝试使用另一种方法打印输入。我的阵列的内容必须打印出来。

import java.util.Scanner;

public class Running_Calcs {

public static void main(String[] args) {
    Scanner kbd = new Scanner(System.in);

    final int MAX_RUNNERS = 4;
    banner();
    Runner[] ar = new Runner[MAX_RUNNERS];
 // This is an array for user input. Getter and setter are already set for name,distance,time. 
    for (int i = 0; i < ar.length; i++) {
        System.out.println("\nInformation for runner 1 / 3");
        System.out.print("Name: ");
        String name = kbd.next();
        System.out.print("Miles: ");
        double distance = kbd.nextDouble();
        System.out.print("Minutes: ");
        int time = kbd.nextInt();
    }

    kbd.close();
}

public static void printRunners(Runner[] ar) {
    for (int i = 0; i < ar.length; i++) {
        System.out.println("First Print of runners");
        System.out.println("-----------------------");
        System.out.println(ar[i]);
    }
    banner();

}
// I am trying to print the info from the array in this method. I don't know how. 
//Along with that , I am trying to print the pace and Temp which I already have in my other class. 
private static void banner() {
    System.out.println("---------------------------");
    System.out.println("Track runner info and pace\nGustavo Bruno");
    System.out.println("---------------------------");
}

}

Answer 1

我建议覆盖Runner类的ToString方法

并在方法printRunners

中调用它

public static void printRunners(Runner[] ar) {
    for (int i = 0; i < ar.length; i++) {
        System.out.println("First Print of runners");
        System.out.println("-----------------------");
        System.out.println(ar[i].toString());   //here!!!
    }
    banner();

}

Answer 2

main（）方法在方法中定义名为“ar”的变量。在方法之外无法访问此值。为了访问它，您需要将其声明为类的静态变量：

private static Runner[] ar;

打印出来时，你需要循环它：

for( Runner r : ar ){
    // somehow print out the Runner class (you haven't included this)
    System.out(r.getName() + "\t" + r.getDistance() + "\t" + r.getTime();
}

如果你的跑步者

现在，你遇到的另一个问题是没有任何东西调用printRunners（）方法。我假设您希望在main（）方法结束时调用它？

对象和类。如何使用for循环打印用户输入？

2 个答案: