2015.01.08 awt 사칙연산 과제

 

/*계산버튼을 누르거나 결과 텍스트필드에 마우스클릭하면 계산결과가 나오게 하는 과제*/

 

import java.awt.Button;
import java.awt.Choice;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

class MyFrame extends Frame implements ActionListener,ItemListener,FocusListener{
 Button b,b1;
 TextField tf, tf1, tf2;
 Choice c;
 Panel p1, p2;
 String aa;
 String[] s=new String[]{"","+","-","×","÷"};

 MyFrame(String t) {
  setTitle(t);
  p1 = new Panel(new FlowLayout());
  p2 = new Panel(new FlowLayout());
  b = new Button("계산");
  b1 = new Button("초기화");
  tf = new TextField(10);
  tf1 = new TextField(10);
  tf2 = new TextField(10);
  c = new Choice();
  tf.setText("");
  
  p1.add(tf);
  p1.add(c);
  p1.add(tf1);
  p2.add(b);
  p2.add(tf2);
  p2.add(b1);
  c.add("선택");
  c.add("+");
  c.add("-");
  c.add("×");
  c.add("÷");
 }
 void addComponent() {
  add(p1, "North");
  add(p2, "Center");
 }
 
 void registerEvent() {
  b.addActionListener(this);
  c.addItemListener(this);
  b1.addActionListener(this);
  tf2.addFocusListener(this);
 }
 
 public void actionPerformed(ActionEvent e){
  if(e.getActionCommand()=="계산"){
  int i=c.getSelectedIndex();
  int x=Integer.parseInt(tf.getText());
  int y=Integer.parseInt(tf1.getText());
  int[] ys={0,x+y,x-y,x*y,x/y};
  tf2.setText(x+aa+y+"="+ys[i]);
  }else{
   tf.setText("");
   tf1.setText("");
   tf2.setText("");
   c.select(0);
  }
 }
  public void itemStateChanged(ItemEvent e){
  int i=c.getSelectedIndex();
   aa=s[i];
   }
 
  public void focusGained(FocusEvent f){
   int i=c.getSelectedIndex();
   int x=Integer.parseInt(tf.getText());
   int y=Integer.parseInt(tf1.getText());
   int[] ys={0,x+y,x-y,x*y,x/y};
   tf2.setText(x+aa+y+"="+ys[i]);
  }
  public void focusLost(FocusEvent f){
  }
}
class A {
 public static void main(String args[]) {
  MyFrame f = new MyFrame("사칙연산");
  f.setVisible(true);
  f.setBounds(800, 200, 300, 300);
  f.registerEvent();
  f.addComponent();
 }
}