Question

我在验证数据方面需要帮助。出于某种原因，我不断收到不兼容的错误。我检查了几次，因为我的类型正确。有什么不对，2班。错误是int在驱动程序类中继续在＆＃34; name = student.setName（input）;＆＃34;中引入不兼容的类型。请解释原因？的更新

import java.util.Scanner;
public class P5A
{
public static void main (String args[])
{
    System.out.println( "Always Show" );

    Scanner reader = new Scanner(System.in);

    student student = new student();

    String name, validate, valtests;
    int tests, score;


    System.out.print( "Please enter the students Name: ");
    String input = reader.nextLine();
    student.getName( input);
    student.validateData();
        System.out.print( "Please enter Test (As number 1-3 for test number, then test score):  ");
        tests = student.getScore( reader.nextInt(), reader.nextInt());
        student.setTests(tests);

        System.out.print( "Please enter Test (As number 1-3 for test number, then test score):  ");
        tests = student.getScore( reader.nextInt(), reader.nextInt());
        student.setTests(tests);

        System.out.print( "Please enter Test (As number 1-3 for test number, then test score):    ");
        tests = student.getScore( reader.nextInt(), reader.nextInt());
        student.setTests(tests);

         System.out.println( student.toString());



}//end of main mthod
}//end of main class/Driver

以下是第二节课，自编辑问题以来已编辑。

import java.util.*;
import java.lang.*;
public class student
{
private String name, result, testchange;
private int test1, test2, test3;

public student ()
{
    name = "";
    test1 = 0;
    test2 = 0;
    test3 = 0;
    result = "";
}//constructor

 public String getName (String name)
{
    return name;
}//getting the name

public String validateData ()
{
    if (name == null)name = "Error! Must enter at least one character";
    return name;
}//end validation method

public int getScore (int i, int score)
{
    if (i == 1) test1 = score;
    else if( i == 2)test2 = score;
    else test3 = score;

    if ( i == 1 )return test1;
    else if ( i == 2 ) return test2;
    else return test3;
}//getting score of tests

public String validateTests ()
{
    String testschange;
    if (test1 < 0 || test1 > 100) {
         testschange =  " You have entered an invalid number, between 1-100. \nPlease restart!";
         testschange = Integer.toString( test1 ) ;
    }
    else if (test2 < 0 || test2 > 100) {
        testschange =  " You have entered an invalid number, between 1-100. " + 
        "\nPlease restart!";
        testschange = Integer.toString(test2);
    }
    else if (test3 < 0 || test3 > 100) {
        testschange =  " You have entered an invalid number, between 1-100. " + 
        "\nPlease restart!";
        testschange = Integer.toString(test3);
    }
    else String.toInteger(testchange) = test1 || test2 || test3;
    return testchange;
}//validating the test scores and tesing each one against method

public int getAverage ()
{
    int average;
    average = (int) Math.round((test1 + test2 + test3)/ 3.0);
    return average;
}//getting a average of all the scores

public int getHighScore()
{
    int highscore;
    highscore = test1;
    if (test2 > highscore) highscore = test2;
    if  (test3 > highscore)highscore = test3;
    return highscore;
}//getting the highscores of all three

public String toString()
{
    String str;
    str = "Name: " + name + 
           "\nTest1:  " + test1 +
           "\nTest2:  " + test2 +
           "\nTest3:  " + test3 +
           "\nAverage: " + getAverage() + 
           "\nHighscore: " + getHighScore();
    return str;
}//putting all the tests together to view in termainal


}

Answer 1

这是错误的一行：

name = student.setName( input);

setName对象上的student方法返回void;也就是说，它不会返回值。您无法将void方法的结果分配给任何内容。

删除作业，这将清除您的一个错误。

验证测试分数

1 个答案: