关于java Applet小程序

import javaxswing;

import javaawt;

import javaawtevent;

public class Calculator extends JFrame implements ActionListener

{

private boolean dotExist, operated, equaled; // 帮助运算的布尔变量

private double storedNumber; // 目前的结果

private char lastOperator; // 表示上一运算符

private JTextField operation; // 结果栏

private JButton dot, plus, minus, multi, div, sqrt, equal, changePN, clear; // 运算符

private JButton[] numbers; // 数字

// 构造者

public Calculator()

{

setTitle("Calculator");

// 初始化变量

dotExist = false; // 表示当前的数是否有小数点

operated = false; // 表示任意运算符是否被按下

equaled = false; // 表示等号是否被按下

storedNumber = 0;

lastOperator = '';

// 初始化窗口变量

operation = new JTextField("0");

operationsetEditable(false);

numbers = new JButton[10];

for (int i = 0; i < 10; i++)

numbers[i] = new JButton("" + i);

dot = new JButton("");

plus = new JButton("+");

minus = new JButton("-");

multi = new JButton("");

div = new JButton("/");

sqrt = new JButton("√");

equal = new JButton("=");

changePN = new JButton("±");

clear = new JButton("AC");

// 将窗口物体放入窗口

GridBagLayout layout = new GridBagLayout();

getContentPane()setLayout(layout);

addComponent(layout, operation, 0, 0, 4, 1);

addComponent(layout, numbers[1], 1, 0, 1, 1);

addComponent(layout, numbers[2], 1, 1, 1, 1);

addComponent(layout, numbers[3], 1, 2, 1, 1);

addComponent(layout, numbers[4], 2, 0, 1, 1);

addComponent(layout, numbers[5], 2, 1, 1, 1);

addComponent(layout, numbers[6], 2, 2, 1, 1);

addComponent(layout, numbers[7], 3, 0, 1, 1);

addComponent(layout, numbers[8], 3, 1, 1, 1);

addComponent(layout, numbers[9], 3, 2, 1, 1);

addComponent(layout, dot, 4, 0, 1, 1);

addComponent(layout, numbers[0], 4, 1, 1, 1);

addComponent(layout, sqrt, 4, 2, 1, 1);

addComponent(layout, plus, 1, 3, 1, 1);

addComponent(layout, minus, 2, 3, 1, 1);

addComponent(layout, multi, 3, 3, 1, 1);

addComponent(layout, div, 4, 3, 1, 1);

addComponent(layout, equal, 5, 0, 2, 1);

addComponent(layout, changePN, 5, 2, 1, 1);

addComponent(layout, clear, 5, 3, 1, 1);

}

// 对按钮进行反应的方法

public void actionPerformed(ActionEvent e)

{

JButton btn = (JButton)egetSource();

if (btn == clear)

{

operationsetText("0");

dotExist = false;

storedNumber = 0;

lastOperator = '';

}

else if (btn == equal)

{

operate('=');

equaled = true;

}

else if (btn == plus)

{

operate('+');

equaled = false;

}

else if (btn == minus)

{

operate('-');

equaled = false;

}

else if (btn == multi)

{

operate('');

equaled = false;

}

else if (btn == div)

{

operate('/');

equaled = false;

}

else if (btn == changePN)

{

operate('p');

operate('=');

equaled = true;

}

else if (btn == sqrt)

{

operate('s');

operate('=');

equaled = true;

}

else

{

if (equaled)

storedNumber = 0;

for (int i = 0; i < 10; i++)

if (btn == numbers[i])

{

if (operationgetText()equals("0"))

operationsetText("" + i);

else if(! operated)

operationsetText(operationgetText() + i);

else

{

operationsetText("" + i);

operated = false;

}

}

if (btn == dot && ! dotExist)

{

operationsetText(operationgetText() + "");

dotExist = true;

}

}

}

// 进行运算的方法

private void operate(char operator)

{

double currentNumber = DoublevalueOf(operationgetText())doubleValue();

if (lastOperator == '')

storedNumber = currentNumber;

else if (lastOperator == '+')

storedNumber += currentNumber;

else if (lastOperator == '-')

storedNumber -= currentNumber;

else if (lastOperator == '')

storedNumber = currentNumber;

else if (lastOperator == '/')

storedNumber /= currentNumber;

else if (lastOperator == 'p')

storedNumber = -1;

else if (lastOperator == 's')

storedNumber = Mathsqrt(currentNumber);

else if (lastOperator == '=' && equaled)

storedNumber = currentNumber;

operationsetText("" + storedNumber);

operated = true;

lastOperator = operator;

}

// 快捷使用GridBagLayout的方法

private void addComponent(GridBagLayout layout, Component component, int row, int col, int width, int height)

{

GridBagConstraints constraints = new GridBagConstraints();

constraintsfill = GridBagConstraintsBOTH;

constraintsinsets = new Insets(10, 2, 10, 2);

constraintsweightx = 100;

constraintsweighty = 100;

constraintsgridx = col;

constraintsgridy = row;

constraintsgridwidth = width;

constraintsgridheight = height;

layoutsetConstraints(component, constraints);

if (component instanceof JButton)

((JButton)component)addActionListener(this);

getContentPane()add(component);

}

// 主方法初始化并显示窗口

public static void main(String[] args)

{

Calculator calc = new Calculator();

calcsetSize(290, 400);

calcsetVisible(true);

}

}

如果你想加sin cos tan的话就建它们的按钮 在actionPerformed方法中的if-else语句中加else if (btn == sin){operate('S');operate('=');equaled = true;}然后在operate方法加对应的语句就行了记忆M+, M-没时间搞 这个应该比较简单容易明白吧

>

searchwxml部分内容：

<view class='search_box page_row'>

<view class='search'>

<view class='search_item'>

<icon class='search_icon' size='20' type='search'></icon>

<input value='' placeholder='搜索您要找的商品' bindinput='bindInput'/>

</view>

</view>

<view class='search_btn' bindtap='search'>搜索</view>

</view>

searchwxss样式部分：

search_box{width:100%;background:#2587f1;padding:0 0 10px;display: flex;flex-direction: row}

search{width: calc( 100% - 64rpx );}

search_item{border: 1px solid #d0d0d0;border-radius: 10rpx;margin-left: 20rpx;background:#fff;}

search_item input{margin-left: 60rpx;height: 60rpx;border-radius: 5px;background:#fff;}

search_btn{width: 15%;height: 60rpx;line-height:60rpx;text-align: center;background:transparent;color:#fff;}

search_icon{margin: 10rpx 10rpx 10rpx 10rpx;position: absolute;left:25rpx;z-index: 2;width: 20px;height: 20px;text-align: center;}

Calendar类有一个方法add方法可以使用，例如calendaradd(CalendarWEEK_OF_YEAR, -1);表示把时间向上推一周，calendaradd(CalendarYEAR, -1);表示把时间向上推一年。下面是一个具体的实例：

public class DateCalcTest

{

public static void main(String[] args)

{

Calendar calendar = CalendargetInstance();

Date date = new Date(SystemcurrentTimeMillis());

calendarsetTime(date);

// calendaradd(CalendarWEEK_OF_YEAR, -1);

calendaradd(CalendarYEAR, -1);

date = calendargetTime();

Systemoutprintln(date);

}

}

class Program

{

static void Main(string[] args)

{

Angle MyJuge = new Angle();

ConsoleWrite("请输入三角形的三个边：");

double a, b, c;

a= doubleParse (ConsoleReadLine());

b = doubleParse (ConsoleReadLine());

c= doubleParse (ConsoleReadLine());

if (a <= 0 || b <= 0 || c <= 0)

{

ConsoleWriteLine("请正确输入三角形的边长，边长必须为大于零的数！");

}

else

{

MyJugeTheJudge(a,b,c);

}

ConsoleReadLine();

}

}

class Angle

{

public void TheJudge(double a,double b,double c)

{

if (a + b > c && a + c > b && b + c > a)

{

ConsoleWriteLine("三个数可以构成一个三角形！");

if (a a == b b + c c || b b == a a + c c || c c == b b + a a)

{

ConsoleWriteLine("并且这三个数可以构成一个直角三角形！！");

if (a a == b b + c c)

ConsoleWriteLine("面积是："+(bc/2)ToString ());

else if(b b == a a + c c)

ConsoleWriteLine("面积是：" + (a c / 2)ToString());

else if(c c == b b + a a)

ConsoleWriteLine("面积是：" + (a c / 2)ToString());

}

else

{

ConsoleWriteLine("但是不能构成一个直角三角形！！");

}

}

else

{

ConsoleWriteLine("这三个数不能构成一个三角形！");

}

}

}

我也只会做到这里，知道怎样实现任何一个输入框中没有输入文字有错误信息提示！！请你公布答案。

<view>{{min}}:{{sec}}</view>

//计时器,cycleTime为豪秒数

  timerSec(cycleTime) {

    var that = this

    let intervalsec = null //倒计时函数

    intervalsec = setInterval(function() {

      cycleTime--;

      thatsetData({

        min: parseInt(cycleTime / 60) < 10 '0' + parseInt(cycleTime / 60) : parseInt(cycleTime / 60),

        sec: (cycleTime % 60) < 10 '0' + (cycleTime % 60) : (cycleTime % 60),

      })

      if (cycleTime == 0) {

        clearInterval(intervalsec)

      }

    }, 1000)

  },

import javautilScanner;

public class SavingAccount {

public static double account = 3000;

public static double rate = 003;

public void update(double rate){

thisrate = rate;

}

//flag 用来计算年利息和月利息,flag等true计算月利息

public double calc(double account , double rate , boolean flag){

if(flag)

return account rate / 12;

return account rate;

}

static class Test{

public static void main(String[] args) {

Systemoutprintln("原始存款:"+SavingAccountaccount + " \n原始利率:" +SavingAccountrate );

SavingAccount sa = new SavingAccount();

Systemoutprintln("原始年利息:"+sacalc(SavingAccountaccount,SavingAccountrate,false));

Systemoutprintln("原始月利息:"+sacalc(SavingAccountaccount,SavingAccountrate,true));

Systemoutprintln("######请输入新的利率######");

Scanner scanner = new Scanner(Systemin);

saupdate(scannernextDouble());

Systemoutprintln("更新后的利率:"+SavingAccountrate);

Systemoutprintln("更新后的年利息:"+sacalc(SavingAccountaccount,SavingAccountrate,false));

Systemoutprintln("更新后的月利息:"+sacalc(SavingAccountaccount,SavingAccountrate,true));

//更新后的存款怎么算 你是多长时间更新一次

Systemoutprintln("更新后的存款:"+(SavingAccountaccount+sacalc(SavingAccountaccount,SavingAccountrate,false)));

}

}

}

不知道对不对,我理解的是这样的了

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