whiledemo.java

来自「JAVA 2应用开发指南」· Java 代码 · 共 35 行

//whileDemo.Java
import javax.swing.JOptionPane;
    public class whileDemo{    
       // main method begins execution of Java application
      public static void main( String args[] ) 
      {
         int total,          // sum of grades input by user
             gradeCounter,   // number of grades entered
             gradeValue,     // grade value
             average;        // average of all grades
         String grade;       // grade typed by user      
         // Initialization Phase
         total = 0;          // clear total
         gradeCounter = 1;   // prepare to loop      
         // Processing Phase
         while ( gradeCounter <= 5 ) {  // loop 5 times   
            // prompt for input and read grade from user
            grade = JOptionPane.showInputDialog(
               "Enter integer grade : " );   
            // convert grade from a String to an integer
            gradeValue = Integer.parseInt( grade );   
            // add gradeValue to total
            total = total + gradeValue;    
	    gradeCounter = gradeCounter + 1;  
        }  // end while structure      
         // Termination Phase
         average = total / 5;  // perform integer division
         // display average of exam grades
         JOptionPane.showMessageDialog( null, 
            "Class average is " + average, "Class Average",
            JOptionPane.INFORMATION_MESSAGE );   
          System.exit( 0 );     // terminate the program   
      }  // end method main     
}