test14.java

java 随机数与多维数组应用~~~ ~~~~~`

import java.applet.*;
import java.awt.*;

public class test14 extends Applet {
     double a[][]=new double[4][4];
     double temp,ax,ay;
     int min=0,max=100,pt=0,count=20,i=0,j=0,point;
     Label lb1=new Label("第");
     TextField tf =new TextField(5);
     Button bt1=new Button("行");
     Button bt2=new Button("列");
     Label lb2=new Label("的和为");
     TextField tf1=new TextField(20);
    public test14() {
    add(lb1);add(tf);add(bt1);add(bt2);
    add(lb2);add(tf1);
    tf1.setEditable(false);
      for (i=0;i<4;i++)
         for(j=0;j<4;j++)
         a[i][j]=min + (double)(Math.random()*(max-min+1));
    }
    public void paint(Graphics g)
    {
    temp=a[0][0];
      for (i=0;i<4;i++)
      {
         for(j=0;j<4;j++)
         {
          g.drawString(Double.toString(a[i][j]),20+i*150,50+j*50);
          //g.drawString("主对角线和："a[][]+a[][]+a[][]+a[][],500,500);
         }
      }
      double al=a[0][0]+a[1][1]+a[2][2]+a[3][3];
      g.drawString("主对角线和:"+Double.toString(al),20,220);
      double bl=a[3][0]+a[2][1]+a[1][2]+a[0][3];
      g.drawString("副对角线和:"+Double.toString(bl),250,220);
      for (i=0;i<4;i++)
      {
         for(j=0;j<4;j++)
         {
           if(a[i][j]>temp)
              temp=a[i][j];
         }
      }
      g.drawString("最大的元素:"+Double.toString(temp),450,220);
    }
    public boolean action(Event evt ,Object obj){

      if (evt.target==bt1)
      {
        try{
        point=Integer.parseInt(tf.getText());
        ax=a[point][0]+a[point][0]+a[point][0]+a[point][0];
        tf.setText("");
        tf1.setText(Double.toString(ax));
        }
        catch(NumberFormatException e)
        {
        tf1.setText("输入0-3的数字!数字");
        tf.setText("");
        }
        catch(ArrayIndexOutOfBoundsException e)
        {
        tf1.setText("输入0-3的数字!!0-3");
        tf.setText("");
        }
      }
      if(evt.target==bt2)
       {
       try{
        point=Integer.parseInt(tf.getText());
        ay=a[0][point]+a[0][point]+a[0][point]+a[0][point];
        tf.setText("");
        tf1.setText(Double.toString(ay));
        }
        catch(NumberFormatException e)
        {
        tf1.setText("输入0-3的数字!数字");
        tf.setText("");
        }
        catch(ArrayIndexOutOfBoundsException e)
        {
        tf1.setText("输入0-3的数字!!0-3");
        tf.setText("");
        }

       }
      return true;
    }

}