averagerainfallapp.java

还不错的java基本实例

import javax.swing.*;
import javax.swing.JOptionPane;
public class AverageRainfallApp {
    double[] rainfall;
    double[] differece  = new double[12] ;
     public AverageRainfallApp() {
         rainfall =new double[12];
     for(int i=0;i<12;i++)  {
        rainfall[i] =Double.parseDouble(JOptionPane.showInputDialog(
                "请输入" + (i+1)  + "月的平均降雨量值" ));
        }
     }
   public double AnnualAverageRainfall() {
       double sum=0;
       for(int i=0;i<12;i++) {
           sum+=rainfall[i];
       }
       return sum/12;
    }
    public void computeDifferece(){
       for(int i=0;i<12;i++) {
           differece[i] = rainfall[i] - AnnualAverageRainfall();
       }
    }
    public void printArray(double[] aArray) {
        String output="";
        for(int i=0;i<aArray.length;i++){
           output+=String.valueOf( aArray[i])+"\n";
        }
        JOptionPane.showMessageDialog( null,output);
    }
   public static void main( String[] args) {
        AverageRainfallApp app=new AverageRainfallApp();
        app.printArray(app.rainfall);
        app.computeDifferece();
        app.printArray(app.differece);

        String output = "月平均降雨量: "+ app.AnnualAverageRainfall()+"mm"+"\n\n";
        output+="月"+"\t"+ "月降雨量"+"\t"+ "月降雨量与月平均降雨量的偏差"+"\n";
      for( int i=0;i<12;i++){
          output+=(i+1)+"\t"+String.valueOf(app.rainfall[i])+
                  "\t"+String.valueOf(app.differece[i])+"\n";
       }
         JTextArea text1=new JTextArea(15,30);
         text1.setText(output);
    JOptionPane.showMessageDialog( null,text1 ,
              "结果", JOptionPane.PLAIN_MESSAGE )
}