如何阻止循环在Java中运行

Question

如何阻止条件循环运行.例如,如果我编写一个if接受0到100之间值的语句.如果用户输入的数字小于0或大于100,如何停止程序.

import java.util.Scanner;
public class TestScores {
    public static void main(String[]args) {
            int numTests = 0;
            double[] grade = new double[numTests];
            double totGrades = 0;
            double average;

            Scanner keyboard = new Scanner(System.in);

            System.out.print("How many tests do you have? ");

            numTests = keyboard.nextInt();
            grade = new double[(int) numTests];
            for (int index = 0; index < grade.length; index++) {
                    System.out.print("Enter grade for Test " + (index + 1) + ": ");
                    grade[index] = keyboard.nextDouble();                               
                    if (grade[index] < 0 || grade[index]> 100) {
                            try {
                                throw new InvalidTestScore();
                            }
                catch (InvalidTestScore e) {
                                e.printStackTrace();
                            }
                    }
            }

            for (int index = 0; index < grade.length; index++) {
                    totGrades += grade[index];
            }

            average = totGrades/grade.length;
            System.out.print("The average is: " + average);

    }
}

Answer 1

你用的是

break;

关键词.这打破了一个循环.

Answer 2

您可能想要使用 break

for(int i=0; i<100; i++)
{
    if(user entered invalid value)
        break; // breaks out of the for loop
}