Question

我无法弄清楚为什么我无法调用我的方法。我检查了几次并尝试运行它，但它总是在我输入一个值的钱后结束。它应该使用一百，五十，二十，几十，五，单身，四分之一，硬币，镍币和便士返回给定金额的变化金额。因此如果它是42.55美元，那么输出将是＆＃34; 0 0 2 0 0 2 2 0 1 0＆＃34; （两个二十几岁，两个单打，两个季度，一个镍）。提前谢谢！

import java.util.Scanner;
public class MakeChange {
    public static void main(String arg[]) {
    Scanner readmoney = new Scanner(System.in);

    System.out.println("Money amount? >");
    double money = readmoney.nextDouble();
    System.out.println();

    String thing = makeChange(money);
}

public static String makeChange(double money) {

    int hundreds = (int) money/100;

    int fifties = (int)(money/50) - (2*hundreds);

    int twenties = (int) (money/20) - (5*hundreds) - (int)(2.5*fifties);

    int tens = (int)(money/10) - (10*hundreds) - (5*fifties) - (2*twenties);

    int fives = (int)(money/5) - (20*hundreds) - (10*fifties) - (4*twenties) - (2*tens);

    int singles = (int)(money) - (100*hundreds) - (50*fifties) - (20*twenties) - (10*tens) - (5*fives);

    int quarters = (int)(money/0.25) - (400*hundreds) - (200*fifties) - (80*twenties) - (40*tens) - (20*fives) - (4*singles);

    int dimes = (int)(money/0.1) - (1000*hundreds) - (500*fifties) - (200*twenties) - (100*tens) - (50*fives) - (10*singles) - (int)(2.5*quarters);

    int nickels = (int)(money/0.05) - (2000*hundreds) - (1000*fifties) - (400*twenties) - (200*tens) - (100*fives) - (20*singles) - (5*quarters) - (2*dimes);

    int pennies = (int)(money/0.01) - (10000*hundreds) - (5000*fifties) - (2000*twenties) - (1000*tens) - (500*fives) - (100*singles) - (25*quarters) - (10*dimes) - (5*nickels);

    String change = (hundreds + " " + fifties + " " + twenties + " " + tens + " " + fives + " " + singles + " " + quarters + " " + dimes + " " + nickels + " " + pennies);

    return change;

} }

Answer 1

 String thing = makeChange(money);
}
// end of program

您不打印结果。

调用该方法（并且不会因异常而崩溃）。

Answer 2

成功调用该方法。它返回一个结果，将其存储在变量中，然后程序结束。您需要实际将返回值打印到控制台以显示内容。

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

    System.out.println("Money amount? >");
    double money = readmoney.nextDouble();
    System.out.println();

    String thing = makeChange(money);
    System.out.println(thing);
}

有人可以帮我弄清楚为什么我不能打电话给我的方法？

2 个答案: