问题描述
importjava.awt.event.*;importjava.awt.*;importjavax.swing.*;publicclassCalculatorextendsJFrameimplementsActionListener,WindowListener{privateJTextFieldfile;GridBagLayoutgridbag=newGridBagLayout();GridBagConstraintsconstraints=newGridBagConstraints();//JFrameCount=newJFrame();JPanelpane=newJPanel();privatebooleanstart;privatedoubleresult;privateStringlastCommand;privateDialogdialog;privateLabellabel_dialog;voidbuildConstraints(GridBagConstraintsgbc,intgx,intgy,intgw,intgh,intwx,intwy,intix,intiy){gbc.gridx=gx;gbc.gridy=gy;gbc.gridwidth=gw;gbc.gridheight=gh;gbc.weightx=wx;gbc.weighty=wy;gbc.ipadx=ix;gbc.ipady=iy;}JButtondel,N1,N2,N3,N4,N5,N6,N7,N8,N9,N0,add,dec,area,vol,mul,div,ext,sqrt,change,count,pn,dot,equal;publicCalculator(){super("Calculator:");setSize(800,600);this.setResizable(true);file=newJTextField(30);this.add(file);file.setEditable(true);start=true;result=0;lastCommand="=";//FileTextbuildConstraints(constraints,0,0,6,1,60,10,13,13);constraints.fill=GridBagConstraints.BOTH;file=newJTextField(30);gridbag.setConstraints(file,constraints);pane.add(file);//backButtonbuildConstraints(constraints,6,0,1,1,10,0,13,13);constraints.fill=GridBagConstraints.BOTH;del=newJButton("<-");gridbag.setConstraints(del,constraints);pane.add(del);del.addActionListener(this);//Number7buildConstraints(constraints,0,1,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;//constraints.anchor=GridBagConstraints.EAST;N7=newJButton("7");gridbag.setConstraints(N7,constraints);pane.add(N7);N7.addActionListener(this);//Number8buildConstraints(constraints,1,1,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;N8=newJButton("8");gridbag.setConstraints(N8,constraints);pane.add(N8);N8.addActionListener(this);//Number9buildConstraints(constraints,2,1,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;N9=newJButton("9");gridbag.setConstraints(N9,constraints);pane.add(N9);N9.addActionListener(this);//AddButtonbuildConstraints(constraints,3,1,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;add=newJButton("+");gridbag.setConstraints(add,constraints);pane.add(add);add.addActionListener(this);//DecButtonbuildConstraints(constraints,4,1,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;dec=newJButton("-");gridbag.setConstraints(dec,constraints);pane.add(dec);dec.addActionListener(this);//AreaButtonbuildConstraints(constraints,5,1,1,2,10,20,13,13);constraints.fill=GridBagConstraints.BOTH;area=newJButton("AREA");gridbag.setConstraints(area,constraints);pane.add(area);area.addActionListener(this);//VolButtonbuildConstraints(constraints,6,1,1,2,10,20,13,13);constraints.fill=GridBagConstraints.BOTH;vol=newJButton("VOL");gridbag.setConstraints(vol,constraints);pane.add(vol);vol.addActionListener(this);
解决方案
解决方案二：
//Number4buildConstraints(constraints,0,2,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;N4=newJButton("4");gridbag.setConstraints(N4,constraints);pane.add(N4);N4.addActionListener(this);//Number5buildConstraints(constraints,1,2,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;N5=newJButton("5");gridbag.setConstraints(N5,constraints);pane.add(N5);N5.addActionListener(this);//Number6buildConstraints(constraints,2,2,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;N6=newJButton("6");gridbag.setConstraints(N6,constraints);pane.add(N6);N6.addActionListener(this);//MulButtonbuildConstraints(constraints,3,2,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;mul=newJButton("*");gridbag.setConstraints(mul,constraints);pane.add(mul);mul.addActionListener(this);//DivButtonbuildConstraints(constraints,4,2,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;div=newJButton("/");gridbag.setConstraints(div,constraints);pane.add(div);div.addActionListener(this);//Number1buildConstraints(constraints,0,3,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;N1=newJButton("1");gridbag.setConstraints(N1,constraints);pane.add(N1);N1.addActionListener(this);//Number2buildConstraints(constraints,1,3,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;N2=newJButton("2");gridbag.setConstraints(N2,constraints);pane.add(N2);N2.addActionListener(this);//Number3buildConstraints(constraints,2,3,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;N3=newJButton("3");gridbag.setConstraints(N3,constraints);pane.add(N3);N3.addActionListener(this);//PerButtonbuildConstraints(constraints,3,3,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;ext=newJButton("EXT");gridbag.setConstraints(ext,constraints);pane.add(ext);ext.addActionListener(this);//SqrtButtonbuildConstraints(constraints,4,3,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;sqrt=newJButton("SQRT");gridbag.setConstraints(sqrt,constraints);pane.add(sqrt);sqrt.addActionListener(this);//ChangeButtonbuildConstraints(constraints,5,3,1,2,10,20,13,13);constraints.fill=GridBagConstraints.BOTH;change=newJButton("CHANGE");gridbag.setConstraints(change,constraints);pane.add(change);change.addActionListener(this);//CountButtonbuildConstraints(constraints,6,3,1,2,10,20,13,13);constraints.fill=GridBagConstraints.BOTH;count=newJButton("COUNT");gridbag.setConstraints(count,constraints);pane.add(count);count.addActionListener(this);//PnButtonbuildConstraints(constraints,0,4,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;pn=newJButton("+/-");gridbag.setConstraints(pn,constraints);pane.add(pn);pn.addActionListener(this);//Number0buildConstraints(constraints,1,4,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;N0=newJButton("0");gridbag.setConstraints(N0,constraints);pane.add(N0);N0.addActionListener(this);//DotButtonbuildConstraints(constraints,2,4,1,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;dot=newJButton(".");gridbag.setConstraints(dot,constraints);pane.add(dot);dot.addActionListener(this);//EqualButtonbuildConstraints(constraints,3,4,2,1,10,10,13,13);constraints.fill=GridBagConstraints.BOTH;equal=newJButton("=");gridbag.setConstraints(equal,constraints);pane.add(equal);equal.addActionListener(this);this.addWindowListener(newWinClose());this.setVisible(true);}publicvoidactionPerformed(ActionEvente){if(e.getSource().equals(N1)||e.getSource().equals(N2)||e.getSource().equals(N3)||e.getSource().equals(N4)||e.getSource().equals(N5)||e.getSource().equals(N6)||e.getSource().equals(N7)||e.getSource().equals(N8)||e.getSource().equals(N9)||e.getSource().equals(N0)||e.getSource().equals(dot)||e.getSource().equals(dot)){Stringinput=e.getActionCommand();if(start){file.setText("");start=false;if(input.equals("+/-"))file.setText(file.getText()+"-");}if(!input.equals("+/-")){Stringstr=file.getText();if(input.equals("<-")){if(str.length()>0)file.setText(str.substring(0,str.length()-1));}}elsefile.setText(file.getText()+input);}}publicvoidcalculate(doublex){doubled=0;if(lastCommand.equals("+"))result+=x;elseif(lastCommand.equals("-"))result-=x;elseif(lastCommand.equals("*"))result*=x;elseif(lastCommand.equals("/"))result/=x;elseif(lastCommand.equals("="))result=x;elseif(lastCommand.equals("SQRT")){d=Math.sqrt(x);result=d;}elseif(lastCommand.equals("EXP")){d=Math.exp(x);result=d;}file.setText(""+result);}publicInsetsinsets(){returnnewInsets(40,10,10,10);}publicstaticvoidmain(String[]args){Countercount=newCounter();count.pack();count.insets();}publicvoidWindowClosing(WindowEvente){if(e.getSource()==dialog)dialog.setVisible(false);elseSystem.exit(0);}publicvoidwindowOpened(WindowEvente){}publicvoidwindowActivated(WindowEvente){}publicvoidwindowDeactivated(WindowEvente){}publicvoidwindowClosed(WindowEvente){}publicvoidwindowIconified(WindowEvente){}publicvoidwindowDeiconified(WindowEvente){}@OverridepublicvoidwindowClosing(WindowEventarg0){//TODOAuto-generatedmethodstub}}classWinCloseimplementsWindowListener{publicvoidWindowClosing(WindowEvente){System.exit(0);}publicvoidwindowOpened(WindowEvente){}publicvoidwindowActivated(WindowEvente){}publicvoidwindowDeactivated(WindowEvente){}publicvoidwindowClosed(WindowEvente){}publicvoidwindowIconified(WindowEvente){}publicvoidwindowDeiconified(WindowEvente){}@OverridepublicvoidwindowClosing(WindowEvente){//TODOAuto-generatedmethodstub}}
解决方案三：
按钮事件没问题。是布局出了问题。另外，下面有个明显的错误，引用1楼flower454的回复:
publicstaticvoidmain(String[]args){Countercount=newCounter();count.pack();count.insets();}
应该是publicstaticvoidmain(String[]args){Calculatorcount=newCalculator();count.pack();count.insets();}
解决方案四：
请指正一下布局那里有问题？谢谢我是初学者！