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java入门固定代码 java编程常用代码

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给段最简单的java代码让我新手看一下最简单java入门固定代码的java代码肯定就是这个了java入门固定代码，如下：
public class MyFirstApp
{
public static void main(String[] args)
{
System.out.print("Hello world");
}
}
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关于一段入门的java代码1.final TextView textView = (TextView)findViewById(R.id.TextView01); 从资源加载TextView
2.button.setOnClickListener(new View.OnClickListener() {设置button响应click事件
3. public void onClick(View view) {click事件java入门固定代码的方法
4. textView.setText("Button按钮");显示文字
5. }
6.});
跪求简单计算器的java代码，要入门级的编程~~//////////////////////////这个很简单,方法也差不多////////////////////
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class Calculator extends JFrame implements ActionListener
{
///////////////菜单
JMenuBar mb;
JMenumEdit,mFind,mHelp;
JMenuItem mEditCopy,mEditPaste;
JMenuItem mFindStandarded,mFindScience,mFindGroup;
JMenuItem mHelpTopic,mHelpAbout;
JPanel pan;
/////////////按钮
JTextField tf;
JButton butnull;
JButton butBackspace,butCE,butC;
JButton butMC,butMR,butMS,butM;
JButton but1,but2,but3,but4,but5,but6,but7,but8,but9,but0;
JButton butChu,butSqrt,butCheng,butYu,butJian,but1x,butDot,butJia,butEqual,butJJ;
Calculator()
{
mb=new JMenuBar();
mEdit=new JMenu("编辑(E)");
mEdit.setMnemonic('E');
mFind=new JMenu("查看(F)");
mFind.setMnemonic('F');
mHelp=new JMenu("帮助(H)");
mFind.setMnemonic('H');
mEditCopy =new JMenuItem("复制(C)");
mEditCopy.setMnemonic('C');
mEditPaste =new JMenuItem("粘贴(P)");
mEditCopy.setMnemonic('P');
mFindStandarded=new JMenuItem("标准型(T)");
mFindStandarded.setMnemonic('T');
mFindScience=new JMenuItem("科学型(S)");
mFindScience.setMnemonic('S');
mFindGroup =new JMenuItem("数字分组(I)");
mFindGroup.setMnemonic('I');
mHelpTopic =new JMenuItem("帮助主题(H)");
mHelpTopic.setMnemonic('H');
mHelpAbout =new JMenuItem("关于我们(A)");
mHelpAbout.setMnemonic('A');
////////////////////////////添加mb组件beginning
mb.add(mEdit);
mb.add(mFind);
mb.add(mHelp);
mEdit.add(mEditCopy);
mEdit.add(mEditPaste);
mFind.add(mFindStandarded);
mFind.add(mFindScience);
mFind.add(mFindGroup);
mHelp.add(mHelpTopic);
mHelp.add(mHelpAbout);//////////////ending
////////////////////////***创建计算机按钮***////////////////////
Color red=new Color(250,0,0);
Color green=new Color(0,127,0);
butnull=new JButton("?");
butnull.setForeground(red);
butnull.addActionListener(this);
butBackspace =new JButton("Backspace");
butBackspace.setForeground(green);
butCE=new JButton("CE");
butCE.setForeground(green);
butC=new JButton("C");
butC.addActionListener(this);
butC.setForeground(red);
butMC=new JButton("MC");
butMC.setForeground(green);
butMR=new JButton("MR");
butMR.setForeground(green);
butMS=new JButton("MS");
butMS.setForeground(green);
butM=new JButton("M ");
butM.setForeground(green);
butChu=new JButton("/");
butChu.addActionListener(this);
butChu.setForeground(red);
butCheng=new JButton("*");
butCheng.addActionListener(this);
butCheng.setForeground(red);
butJian=new JButton("-");
butJian.addActionListener(this);
butJian.setForeground(red);
butJia=new JButton(" ");
butJia.addActionListener(this);
butJia.setForeground(red);
butEqual=new JButton("=");
butEqual.addActionListener(this);
butEqual.setForeground(red);
Color blue=new Color(0,0,250);
butSqrt=new JButton("sqrt");
butSqrt.setForeground(green);
butYu=new JButton("%");
butYu.setForeground(green);
but1x=new JButton("1/x");
but1x.setForeground(green);
butDot=new JButton(".");
butDot.setForeground(blue);
butDot.addActionListener(this);
butJJ=new JButton(" /-");
butJJ.setForeground(blue);
butJJ.addActionListener(this);
but1=new JButton("1");
but1.addActionListener(this);
but1.setForeground(blue);
but2=new JButton("2");
but2.addActionListener(this);
but2.setForeground(blue);
but3=new JButton("3");
but3.addActionListener(this);
but3.setForeground(blue);
but4=new JButton("4");
but4.addActionListener(this);
but4.setForeground(blue);
but5=new JButton("5");
but5.addActionListener(this);
but5.setForeground(blue);
but6=new JButton("6");
but6.addActionListener(this);
but6.setForeground(blue);
but7=new JButton("7");
but7.addActionListener(this);
but7.setForeground(blue);
but8=new JButton("8");
but8.addActionListener(this);
but8.setForeground(blue);
but9=new JButton("9");
but9.addActionListener(this);
but9.setForeground(blue);
but0=new JButton("0");
but0.addActionListener(this);
but0.setForeground(blue);///////////////////////////////ending
pan=new JPanel(null);//创建最大java入门固定代码的panel
tf=new JTextField("0");//输入显示框
tf.setBounds(5,0,337,25);//显示框设置大小位置
tf.setBackground(Color.white);
tf.setHorizontalAlignment(JTextField.RIGHT);//输入框设置位子居右显示
tf.setEditable(false);
JPanel pa=new JPanel(new BorderLayout());//所有按钮的panel
pa.setBounds(5,35,340,240);
JPanel pp=new JPanel(new BorderLayout());//null,MC,MR,MS,M 的panel;pa的西
JPanel aa=new JPanel(new BorderLayout());//其余所有Button的panel;pa的中
JPanel p =new JPanel(new GridLayout(4,1));//MC,MR,MS,M 的Paneljava入门固定代码，pp的中 北是一个butnull
JPanel a =new JPanel(new GridLayout(1,3));//backspace,ce,c的paneljava入门固定代码，aa的北
JPanel a2=new JPanel(new GridLayout(4,5));//其余的button的panel，aa的中
pa.add(pp,BorderLayout.WEST);
pa.add(aa,BorderLayout.CENTER);
pp.add(butnull,BorderLayout.NORTH);
pp.add(p,BorderLayout.CENTER);
p.add(butMC);
p.add(butMR);
p.add(butMS);
p.add(butM);
aa.add(a,BorderLayout.NORTH);
aa.add(a2,BorderLayout.CENTER);
a.add(butBackspace);
a.add(butCE);
a.add(butC);
a2.add(but7);
a2.add(but8);
a2.add(but9);
a2.add(butChu);
a2.add(butSqrt);
a2.add(but4);
a2.add(but5);
a2.add(but6);
a2.add(butCheng);
a2.add(butYu);
a2.add(but1);
a2.add(but2);
a2.add(but3);
a2.add(butJian);
a2.add(but1x);
a2.add(but0);
a2.add(butJJ);
a2.add(butDot);
a2.add(butJia);
a2.add(butEqual);
this.add(pan);
pan.add(tf);
pan.add(pa);
this.setTitle("我的计算器");
this.setJMenuBar(mb);
this.setBounds(200,300,353,330);//设置窗口大小
this.setResizable(false);
this.setVisible(true);
}
public static void main(String args[])
{
try
{
UIManager.setLookAndFeel(
UIManager.getSystemLookAndFeelClassName());
}
catch (Exception ex)
{
ex.printStackTrace();
}
new Calculator();
}
////////////////////********以下是监听设置和运算*******///////////////////
boolean b=true;//初始值设置为真未点运算符号
String fuhao="";//保存最后一次运算符号，用于进行上次结果的运算
String lastCommand="";//保存按等号前的最后的运算符号
double lastValue=https://www.04ip.com/post/0.0;//保存按等号钱的最后的输入框里的值
double value=https://www.04ip.com/post/0.0;//原值，当你点完运算符的时候计算之前的值
double fuzhi=0.0;
public void actionPerformed(ActionEvent click)/////////////////////行为监听设置
{
if(click.getSource()==butJJ)
{
fuzhi=Double.parseDouble(tf.getText());
if(tf.getText().equals("0")||tf.getText().equals("0."))
{
boolean b=true;
String fuhao="";
double value=https://www.04ip.com/post/0.0;
tf.setText("0");
}
else if(fuzhi0)
{
tf.setText((-fuzhi) "");
}
else
{
tf.setText("-" tf.getText());
}
}
if(click.getSource()==butnull)
{
tf.setText("本计算器版权所有归青软培训--胡迅--2008年10月18日著");
}
if(click.getSource()==butC)
{
tf.setText("0");
lastCommand="";
lastValue=https://www.04ip.com/post/0.0;
b=true;
fuhao="";
value=https://www.04ip.com/post/0.0;
}
if(click.getSource()==but1)
{
if(b==false)
{
tf.setText("1");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("1");
}
else
{
tf.setText(tf.getText() 1);
}
}
if(click.getSource()==but2)
{
if(b==false)
{
tf.setText("2");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("2");
}
else
{
tf.setText(tf.getText() 2);
}
}
if(click.getSource()==but3)
{
if(b==false)
{
tf.setText("3");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("3");
}
else
{
tf.setText(tf.getText() 3);
}
}
if(click.getSource()==but4)
{
if(b==false)
{
tf.setText("4");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("4");
}
else
{
tf.setText(tf.getText() 4);
}
}
if(click.getSource()==but5)
{
if(b==false)
{
tf.setText("5");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("5");
}
else
{
tf.setText(tf.getText() 5);
}
}
if(click.getSource()==but6)
{
if(b==false)
{
tf.setText("6");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("6");
}
else
{
tf.setText(tf.getText() 6);
}
}
if(click.getSource()==but7)
{
if(b==false)
{
tf.setText("7");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("7");
}
else
{
tf.setText(tf.getText() 7);
}
}
if(click.getSource()==but8)
{
if(b==false)
{
tf.setText("8");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("8");
}
else
{
tf.setText(tf.getText() 8);
}
}
if(click.getSource()==but9)
{
if(b==false)
{
tf.setText("9");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("9");
}
else
{
tf.setText(tf.getText() 9);
}
}
if(click.getSource()==but0)
{
if(b==false)
{
tf.setText("0");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("0");
}
else
{
tf.setText(tf.getText() 0);
}
}
if(click.getSource()==butDot)
{
/////////code/////////////////////////////////////////////////////////////////////////////////////////////////////////???
int izhi=Integer.parseInt(tf.getText());
double dzhi=Double.parseDouble(tf.getText());
if(tf.getText().equals("0"))
{
tf.setText("0.");
}
else
{
if(tf.getText().equals("0."))
{
tf.setText("0.");
}
else
{
if(dzhi0)
{
izhi=izhi;
dzhi=dzhi;
if(dzhi==izhi)
{
tf.setText(tf.getText() ".");
}
}
else
{
izhi=-izhi;
dzhi=-dzhi;
if(dzhi==izhi)
{
tf.setText(tf.getText() ".");
}
}
}
}
}
if(click.getSource()==butJia)///////////////////////////////////////////////" "
{
if(tf.getText().equals("0"))
{
}
else if(fuhao=="")
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/tfvaluejia;
tf.setText("" value);
b=false;
fuhao=" ";
}
else if(fuhao=="*")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value*tfvalueCheng;
tf.setText("" value);
b=false;
}
else if(fuhao=="/")
{
double tfvalueChu;
tfvalueChu=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value/tfvalueChu;
tf.setText("" value);
b=false;
}
else if(fuhao=="-")
{
double tfvaluejian;
tfvaluejian=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value-tfvaluejian;
tf.setText("" value);
b=false;
}
else if(fuhao=="=")
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/tfvaluejia;
b=false;
}
else
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());//2
value=https://www.04ip.com/post/value tfvaluejia;
tf.setText("" value);
b=false;
}
lastValue=https://www.04ip.com/post/Double.parseDouble(tf.getText());
fuhao=" ";
lastCommand=" ";
}
if(click.getSource()==butCheng)////////////////////////////////////////////////////////////"*"
{
if(tf.getText().equals("0"))
{
}
else if(fuhao=="")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/tfvalueCheng;
tf.setText("" value);
b=false;
fuhao="*";
}
else if(fuhao==" ")
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value tfvaluejia;
tf.setText("" value);
b=false;
}
else if(fuhao=="/")
{
double tfvalueChu;
tfvalueChu=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value/tfvalueChu;
tf.setText("" value);
b=false;
}
else if(fuhao=="-")
{
double tfvaluejian;
tfvaluejian=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value-tfvaluejian;
tf.setText("" value);
b=false;
}
else if(fuhao=="=")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/tfvalueCheng;
b=false;
}
else
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value*tfvalueCheng;
tf.setText("" value);
b=false;
}
lastValue=https://www.04ip.com/post/Double.parseDouble(tf.getText());
fuhao="*";
lastCommand="*";
}
if(click.getSource()==butChu)//////////////////////////////////////////////"/"
{
if(tf.getText().equals("0"))
{
}
else if(fuhao=="")
{
double tfvalueChu;
tfvalueChu=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/tfvalueChu;
tf.setText("" value);
b=false;
fuhao="/";
}
else if(fuhao==" ")
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value tfvaluejia;
tf.setText("" value);
b=false;
}
else if(fuhao=="*")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value*tfvalueCheng;
tf.setText("" value);
b=false;
}
else if(fuhao=="-")
{
double tfvaluejian;
tfvaluejian=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value-tfvaluejian;
tf.setText("" value);
b=false;
}
else if(fuhao=="=")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/tfvalueCheng;
b=false;
}
else
{
double tfvalueChu;
tfvalueChu=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value/tfvalueChu;
tf.setText("" value);
b=false;
}
lastValue=https://www.04ip.com/post/Double.parseDouble(tf.getText());
fuhao="/";
lastCommand="/";
}
if(click.getSource()==butJian)////////////////////////////////////////////////////////////////////////"-"
{
if(tf.getText().equals("0"))
{
}
else if(fuhao=="")
{
double tfvaluejian;
tfvaluejian=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/tfvaluejian;
tf.setText("" value);
b=false;
fuhao="/";
}
else if(fuhao==" ")
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value tfvaluejia;
tf.setText("" value);
b=false;
}
else if(fuhao=="*")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value*tfvalueCheng;
tf.setText("" value);
b=false;
}
else if(fuhao=="/")
{
double tfvalueChu;
tfvalueChu=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value/tfvalueChu;
tf.setText("" value);
b=false;
}
else if(fuhao=="=")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/tfvalueCheng;
b=false;
}
else
{
double tfvaluejian;
tfvaluejian=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value-tfvaluejian;
tf.setText("" value);
b=false;
}
lastValue=https://www.04ip.com/post/Double.parseDouble(tf.getText());
fuhao="-";
lastCommand="-";
}
if(click.getSource()==butEqual)//////////////////////////////////////////"="
{
if(tf.getText().equals("0"))
{
}
if(fuhao==" ")
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value tfvaluejia;
tf.setText("" value);
b=false;
}
else if(fuhao=="*")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value*tfvalueCheng;
tf.setText("" value);
b=false;
}
else if(fuhao=="/")
{
double tfvalueChu;
tfvalueChu=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value/tfvalueChu;
tf.setText("" value);
b=false;
}
else if(fuhao=="-")
{
double tfvaluejian;
tfvaluejian=Double.parseDouble(tf.getText());
value=https://www.04ip.com/post/value-tfvaluejian;
tf.setText("" value);
b=false;
}
else if(fuhao=="=")
{
if(lastCommand==" ")
{
value = https://www.04ip.com/post/valuelastValue;
tf.setText("" value);
b=false;
}
else if(lastCommand=="-")
{
value = https://www.04ip.com/post/value - lastValue;
tf.setText("" value);
b=false;
}
if(lastCommand=="*")
{
value = https://www.04ip.com/post/value *lastValue;
tf.setText("" value);
b=false;
}
if(lastCommand=="/")
{
value = https://www.04ip.com/post/value /lastValue;
tf.setText("" value);
b=false;
}
}
fuhao="=";
}
}
}
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