計(jì)算器加入異常處理機(jī)制

1、計(jì)算器加入異常處理機(jī)制計(jì)算器加入異常處理機(jī)制imptjava.awt.Colimptjava.awt.Containerimptjava.awt.Frameimptjava.awt.GridLayoutimptjava.awt.Panelimptjava.awt.event.ActionEventimptjava.awt.event.ActionListenerimptjava.awt.event.WindowAdapterimptja

2、va.awt.event.WindowEventimptjavax.swing.JButtonimptjavax.swing.JFrameimptjavax.swing.JTextFieldpublicclassCalculatextendsFrameimplementsActionListenerprivatestaticfinallongserialVersionUID=1LJFramecalculat=newJFrame(“計(jì)算器

3、“)PanelpanelJTextFieldtf1Stringstring[]=“sqrt““““Backspace““C““7““8““9““““4““5““6““““1““2““3““““0““.““=“““JButtonbuttons[]=newJButton[string.length]StringBufferstr=newStringBuffer()顯示屏所顯示的字符串doublexyx和y都是運(yùn)算數(shù)intzZ表示單擊了那一個(gè)

4、運(yùn)算符.0表示““1表示““2表示““3表示““staticdoublem記憶的數(shù)字publicCalculat()System.out.println(“1“)tf1=newJTextField(27)顯示屏tf1.setHizontalAlignment(JTextField.RIGHT)tf1.setEnabled(false)tf1.setText(“0“)panel=newPanel()實(shí)例化面板Containerc=calc

5、ulat.getContentPane()c.add(tf1“Nth“)c.add(panel“Center“)panel.setLayout(newGridLayout(5455))添加面板panel中的組件和設(shè)置其在框架中的位置和大小str.setLength(0)清空緩沖區(qū)以便接收新的另一個(gè)運(yùn)算數(shù)y=0dz=0elseif(e2.getSource()==buttons[15])單擊減號(hào)按鈕獲得x的值和z的值并清空y的值x=Dou

6、ble.parseDouble(tf1.getText().trim())str.setLength(0)y=0dz=1elseif(e2.getSource()==buttons[11])單擊乘號(hào)按鈕獲得x的值和z的值并清空y的值x=Double.parseDouble(tf1.getText().trim())str.setLength(0)y=0dz=2elseif(e2.getSource()==buttons[7])單擊除號(hào)按

7、鈕獲得x的值和z的值并空y的值x=Double.parseDouble(tf1.getText().trim())str.setLength(0)y=0dz=3elseif(e2.getSource()==buttons[18])單擊等號(hào)按鈕輸出計(jì)算結(jié)果str.setLength(0)switch(z)case0:tf1.setText(““(xy))breakcase1:tf1.setText(““(xy))breakcase2:tf