gradetester.java

基于netbeans的java桌面应用程序合集

package com.sun.tiger.enumerated;

import java.io.IOException;
import java.io.PrintStream;

public class GradeTester {
    
    private Student student1, student2, student3;
    
    public GradeTester() {
        student1 = new Student("Brett", "McLaughlin");
        student2 = new Student("Ben", "Rochester");
        student3 = new Student("Dennis", "Erwin");
    }
    
    public void testGradeAssignment(PrintStream out) throws IOException {
        student1.assignGrade(Grade.B);
        student2.assignGrade(Grade.INCOMPLETE);
        student3.assignGrade(Grade.A);
    }
    
    public void listGradeValues(PrintStream out) throws IOException {
        Grade[] gradeValues = Grade.values();

        for (Grade g : gradeValues ) {
            out.println("Allowed value: '" + g + "'");
        }
    }
    
    public void testSwitchStatement(PrintStream out) throws IOException {
        StringBuffer outputText = new StringBuffer(student1.getFullName());
        
        switch (student1.getGrade()) {
            case A:
                outputText.append(" excelled with a grade of A");
                break;
            case B: // fall through to C
            case C:
                outputText.append(" passed with a grade of ")
                .append(student1.getGrade().toString());
                break;
            case D: // fall through to F
            case F:
                outputText.append(" failed with a grade of ")
                .append(student1.getGrade().toString());
                break;
            case INCOMPLETE:
                outputText.append(" did not complete the class.");
                break;
            default:
                outputText.append(" has a grade of ")
                .append(student1.getGrade().toString());
                break;
        }
        
        out.println(outputText.toString());
    }
    
    public static void main(String[] args) {
        try {
            GradeTester tester = new GradeTester();
            
            tester.testGradeAssignment(System.out);
            tester.listGradeValues(System.out);
            tester.testSwitchStatement(System.out);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
}