drc.java

是一个成绩管理系统

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class  Drc extends JPanel
{
	
	JButton b = new JButton("y");
	JTextField t = new JTextField(5);
	JPanel p1 = new JPanel();
	int h1 = 15;
	int[] numbers = {19, 13, 21, 12, 17, 8};

 
protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    
    setLayout(new FlowLayout());
     g.drawString("考试成绩统计图",170,50);
   
  int width = getWidth();
  int height = getHeight();
  int x1 = (width - 75) / 12;
  int x2 = (width - 75) / 10;  
  int w = width - 75;
  int h = height - 70;
  
  
  g.setColor(Color.white);
  g.fillRect(0, 0, width, height);
  //画X轴 
  g.setColor(Color.black);
  g.drawLine(25,height - 20,width - 50,height - 20);
    
    
  
  //画Y轴
  g.setColor(Color.black);
  g.drawLine(25,50,25,height - 20);
  
  
  
    
    
   //定义直方图的高度
  int h2=12,h3=23,h4=13,h5=16;
 
 g.setColor(Color.black);
 g.drawString("人数",8,40);
 
   //定义Y轴上的人数标度
  g.setColor(Color.black);
  g.drawString("0",17, height - 20);
 
  //定义Y轴上的人数标度
  g.setColor(Color.black);
  g.drawString("5",17, height -(height - 70) /5 - 20);
  
  //定义Y轴上的人数标度
  g.setColor(Color.black); 
  g.drawString("10",10,height -(height - 70) /5 * 2 - 20);
 
  //定义Y轴上的人数标度
  g.setColor(Color.black);
  g.drawString("15",10, height -(height - 70) /5 * 3 - 20);
  
  
  //定义Y轴上的人数标度
  g.setColor(Color.black);
  g.drawString("20",10, height -(height - 70) /5 * 4 - 20);
  
  
  //定义Y轴上的人数标度
  g.setColor(Color.black);
  g.drawString("25",10, 55);
  
  //显示<60的直方图
;
  g.setColor(Color.yellow);
  g.fillRect(25 + x1,50 + (int)(h * (25 -numbers[1]) / 25),x2,h * numbers[1] / 25);
  g.setColor(Color.BLACK);
  g.drawString("<60分",25 + x1, height - 10);
  
  
  //显示60-69的直方图

  g.setColor(Color.green);
  g.fillRect(24 + x1 * 2 + x2,50 + (int)(h * (25 -numbers[2]) / 25),x2 +1 ,h * numbers[2] / 25);
  g.setColor(Color.BLACK);
  g.drawString("60-69分",25 + x1  * 2+ x2, height - 10);
    
  //显示70-79的直方图

  g.setColor(Color.blue);
  g.fillRect(24 + x1 * 3 + x2 * 2,50 + (int)(h * (25 - numbers[3]) / 25),x2 +1 ,h * numbers[3] / 25);
  g.setColor(Color.BLACK);
  g.drawString("70-79分",25 + x1  * 3 + x2 * 2, height - 10);
  
  //显示80-89的直方图

  g.setColor(Color.cyan);
  g.fillRect(24 + x1 * 4 + x2 * 3,50 + (int)(h * (25 - numbers[4]) / 25),x2 +1 ,h * numbers[4] / 25);
  g.setColor(Color.BLACK);
  g.drawString("80-89分",25 + x1  * 4 + x2 * 3, height - 10);
  
  //显示>=90的直方图
 
  g.setColor(Color.pink);
  g.fillRect(24 + x1 * 5 + x2 * 4,50 + (int)(h * (25 - numbers[5]) / 25),x2 +1 ,h * numbers[5] / 25);
  g.setColor(Color.BLACK);
  g.drawString(">=90分",25 + x1  * 5 + x2 * 4, height - 10);
 }
 

 
 
 public void setNumbers(int[] numbers) {
 	this.numbers = numbers;
 	repaint();
 }
/* public static void main(String args[])
 {
  JFrame frame=new JFrame();
  //frame.setLayeredPane(new BorderLayouy());
  //frame.getContentPane().add(p1, BorderLayout.NORTH);
  frame.getContentPane().add(new Drawrec());
  frame.setTitle("成绩考试统计图");
  frame.setSize(400,270);
  frame.setVisible(true);
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  
 }**/

}