用JAVA语言编写一个“猜数字游戏”的程序

int num = (int)(Math.random()*100)+1

Scanner sc = new Scanner(System.in)   

int guessNum = -1

while (guessNum != num) {

System.out.println("请输入1-100之间整数")

guessNum = sc.nextInt()

if (guessNum == num) {

System.out.println("中啦")

} elseif (guessNum <num) {

System.out.println("小啦")

} else {

System.out.println("大了")

}

}

扩展资料：

编写思路

1、成1-100之间随机数

(int)(Math.random()*100)+1

提示用户输入数字，

Scanner  sc=new Scanner(System.in)

int guessNum = sc.nextInt()

需要将随机数和用户输入的数字进行比较。

猜一次：

Scanner sc = new Scanner(System.in)

int num = (int)(Math.random()*100)+1

System.out.println("请输入0-100之间整数")

int guessNum = sc.nextInt()

if (guessNum == num) {

System.out.println("中啦")

} elseif (guessNum <num) {

System.out.println("小啦")

} else {

System.out.println("大了")

}

二、使用while循环

publicstaticvoid main(String[] args) {

int num = (int)(Math.random()*100)+1

Scanner sc = new Scanner(System.in)

while (true) {

System.out.println("请输入1-100之间整数")

int guessNum = sc.nextInt()

if (guessNum == num) {

System.out.println("中啦")

} elseif (guessNum <num) {

System.out.println("小啦")

} else {

System.out.println("大了")

}

}

}

三、最后用while() 括号中的条件表达式，当用户猜测的数和系统生成的数字不相等时，就需要继续循环。

最终版本完整代码如下。无注视。希望对你有帮助。

package com

import java.awt.event.ActionEvent

import java.awt.event.ActionListener

import java.beans.PropertyChangeEvent

import java.beans.PropertyChangeListener

import java.util.ArrayList

import java.util.List

import javax.swing.JButton

import javax.swing.JFormattedTextField

import javax.swing.JFrame

import javax.swing.JSpinner

import javax.swing.SpinnerListModel

import javax.swing.event.ChangeEvent

import javax.swing.event.ChangeListener

public class MySwing extends JFrame

{

public JSpinner js

public MySwing()

{

setSize(350, 400)

setLayout(null)

setResizable(false)

add(getJSpinner())

add(getJButton())

setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE)

setVisible(true)

}

public JSpinner getJSpinner()

{

List<String>s = new ArrayList<String>()

for (int i = 2i <= 200i++)

{

s.add("" + i)

}

js = new JSpinner(new SpinnerListModel(s))

js.setBounds(new java.awt.Rectangle(10, 10, 60, 20))

JFormattedTextField jf=new JFormattedTextField()

jf.setText(js.getValue().toString())

jf.addPropertyChangeListener(new MyPropertyChangeListener())

js.setEditor(jf)

js.addChangeListener(new MyChangeListener())

return js

}

public JButton getJButton()

{

JButton jb = new JButton()

jb.setBounds(new java.awt.Rectangle(40, 40, 60, 20))

jb.addActionListener(new MyAl(js))

return jb

}

public static void main(String[] aa)

{

new MySwing()

}

}

class MyChangeListener implements ChangeListener

{

public void stateChanged(ChangeEvent e)

{

JSpinner spinner = (JSpinner) (e.getSource())

JFormattedTextField jf= (JFormattedTextField)spinner.getEditor()

jf.setValue(spinner.getValue())

}

}

class MyPropertyChangeListener implements PropertyChangeListener

{

public void propertyChange(PropertyChangeEvent e)

{

JFormattedTextField jf = (JFormattedTextField) e.getSource()

JSpinner spinner = (JSpinner) jf.getParent()

String name = e.getPropertyName()

if ("value".equals(name))

{

try

{

spinner.setValue(jf.getValue())

}

catch (IllegalArgumentException iae)

{

}

}

}

}

class MyAl implements ActionListener

{

JSpinner js

public MyAl(JSpinner _s)

{

js = _s

}

public void actionPerformed(ActionEvent e)

{

JFormattedTextField s = (JFormattedTextField) js.getEditor()

String ss = s.getText()

System.out.println("您输入的是 " + ss + " 您觉得你输入的对么？")

}

}

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