「java连乘」java 连接
今天给各位分享java连乘的知识，其中也会对java 连接进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！
本文目录一览：
- 1、java编一个计算器的代码
- 2、（java） 将一个自然数分解成几个质数的连乘积形式 举例 input：60 output：2*2*3*5
- 3、【java】连加和连乘
- 4、java一个简单的连乘问题！
- 5、java编程语言谁会，下面题目帮解答一下，要详细步骤啊…………谢谢 急急急求……
- 6、java 1到100连乘
java编一个计算器的代码
界面漂亮堪比系统自带计算器，功能完美加减乘除开平方等等全部具备，还有清零按钮，小数点的使用，连加连乘功能完全参考系统官方计算器经过长期调试改进而成，马上拷贝代码拿去试试看吧，绝不后悔！
代码如下：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class Counter {
public static void main(String[] args) {
CounterFrame frame = new CounterFrame();
frame.show();
}
}
class CounterFrame extends JFrame {
public CounterFrame() {
JMenuBar menuBar = new JMenuBar();
JMenu menuFile = new JMenu();
JMenu menuFile1 = new JMenu();
JMenu menuFile2 = new JMenu();
JMenu menuFile3 = new JMenu();
JMenuItem menuFileExit = new JMenuItem();
menuFile.setText("文件");
menuFile1.setText("编辑");
menuFile2.setText("查看");
menuFile3.setText("帮助");
menuFileExit.setText("退出");
menuFileExit.addActionListener
(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
CounterFrame.this.windowClosed();
}
}
);
menuFile.add(menuFileExit);
menuBar.add(menuFile);
menuBar.add(menuFile1);
menuBar.add(menuFile2);
menuBar.add(menuFile3);
setTitle("计算器");
setJMenuBar(menuBar);
setSize(new Dimension(400, 280));
this.getContentPane().add(new Allpanel());
this.addWindowListener
(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
CounterFrame.this.windowClosed();
}
}
);
}
protected void windowClosed() {
System.exit(0);
}
}
class Tool {
public static Tool instance;
private JTextField field;
private Tool() {
this.field=new JTextField(30);
this.field.setHorizontalAlignment(JTextField.RIGHT);
}
public static Tool getinstance()
{
if(instance==null)
{
instance=new Tool();
}
return instance;
}
public JTextField getfield()
{
return (this.field);
}
}
class Allpanel extends JPanel {
public Allpanel() {
this.setLayout(new BorderLayout(0,7));
Northpanel np=new Northpanel();
Centerpanel cp=new Centerpanel();
this.add(np,BorderLayout.NORTH);
this.add(cp,BorderLayout.CENTER);
}
}
class Centercenter extends JPanel {
static Vector Vec=new Vector();
static Vector vc=new Vector();
static Vector vc1=new Vector();
static Vector vc2=new Vector();
static Vector vc3=new Vector();
static String begin="yes";
static double add;
static double jq;
static double cs;
static double cq;
static double dy;
static String jg;
static String what;
static double tool=0;
static String to="yes";
/**
* Method Centercenter
*
*
*/
public Centercenter() {
// TODO: Add your code here
final JTextField text=Tool.getinstance().getfield();
this.setLayout(new GridLayout(4,5,3,3));
String arg[] ={"7","8","9","/","sqrt","4","5","6","*","%","1","2","3","-","1/x","0","+/-",".","+","="};
for(int i=0;i20;i++)
{
final JButton b=new JButton(arg[i]);
//this.add(new JButton(arg[i]));
this.add(b);
if(i==0||i==1||i==2||i==5||i==6||i==7||i==10||i==11||i==12||i==15)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mark=b.getText();
String ma=text.getText();
if(vc3.contains("v3"))
{
text.setText("0."+mark);
vc3.clear();
}
else if(vc.contains("a"))
{
if(vc2.contains("v2"))
{
text.setText("0."+mark);
vc.clear();
vc2.clear();
}
else
{
text.setText(mark);
vc.clear();
Vec.clear();
Vec.add(mark);
}
}
else
{
text.setText(ma.trim()+mark);
Vec.add(mark);
}
begin="no";
to="yes";
}
});
}
if(i==17)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mar=b.getText();
String m=text.getText();
if("yes".equals(begin))
{
vc3.add("v3");
}
if(vc1.contains("v1"))
{
vc2.add("v2");
vc1.clear();
}
if(!Vec.contains(".")!vc.contains("a"))
{
text.setText(m.trim()+mar);
Vec.add(".");
}
}
});
}
if(i==18)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
add=Double.parseDouble(ma);
if(what==null)
{
tool=add;
what="add";
}
else
{
tool=tool+add;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="+";
}
});
}
if(i==13)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
jq=Double.parseDouble(ma);
if(what==null)
{
tool=jq;
what="jq";
}
else
{
tool=tool-jq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="-";
}
});
}
if(i==3)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cq=Double.parseDouble(ma);
if(what==null)
{
tool=cq;
what="cq";
}
else
{
tool=tool/cq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="/";
}
});
}
if(i==4)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cq=Double.parseDouble(ma);
text.setText(String.valueOf(Math.sqrt(cq)));
}
});
}
if(i==8)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cs=Double.parseDouble(ma);
if(what==null)
{
tool=cs;
what="cs";
}
else
{
tool=tool*cs;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="*";
}
});
}
if(i==19)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
dy=Double.parseDouble(ma);
if(what=="add")
{
jg=String.valueOf((tool+dy));
}
if(what=="jq")
{
jg=String.valueOf((tool-dy));
}
if(what=="cs")
{
jg=String.valueOf((tool*dy));
}
if(what=="cq")
{
jg=String.valueOf((tool/dy));
}
if(what==null)
{
if(to=="+")
{
tool=add;
jg=String.valueOf(tool+dy);
}
else if(to=="-")
{
tool=jq;
jg=String.valueOf(dy-tool);
}
else if(to=="*")
{
tool=cs;
jg=String.valueOf(dy*tool);
}
else if(to=="/")
{
tool=cq;
jg=String.valueOf(dy/tool);
}
else
{
jg=String.valueOf(dy);
}
}
text.setText(jg);
Vec.clear();
Vec.add(".");
vc.add("a");
vc1.add("v1");
what=null;
tool=0;
}
});
}
}
}
}
class Centernorth extends JPanel {
public Centernorth() {
final JTextField text=Tool.getinstance().getfield();
JButton jb1=new JButton("Backspace");
JButton jb2=new JButton(" CE ");
JButton jb3=new JButton(" C ");
this.add(jb1);
this.add(jb2);
this.add(jb3);
jb1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String back=Tool.getinstance().getfield().getText();
text.setText(backmethod(back));
Centercenter.Vec.remove(Centercenter.Vec.size()-1);
}
});
jb3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
text.setText("0.");
Centercenter.Vec.clear();
Centercenter.Vec.add(".");
Centercenter.vc.add("a");
Centercenter.begin="yes";
Centercenter.vc1.clear();
Centercenter.what=null;
Centercenter.tool=0;
}
});
}
public String backmethod(String str)
{
return str.substring(0,str.length()-1);
}
}
class Centerpanel extends JPanel {
public Centerpanel() {
this.setLayout(new BorderLayout(8,7));
Centernorth cn=new Centernorth();
Centercenter cc=new Centercenter();
Centerwest cw=new Centerwest();
this.add(cn,BorderLayout.NORTH);
this.add(cc,BorderLayout.CENTER);
this.add(cw,BorderLayout.WEST);
}
}
class Centerwest extends JPanel {
public Centerwest() {
this.setLayout(new GridLayout(4,1,3,3));
this.add(new JButton("MC"));
this.add(new JButton("MR"));
this.add(new JButton("MS"));
this.add(new JButton("M+"));
}
}
class Northpanel extends JPanel {
private JTextField tf;
public Northpanel() {
tf=Tool.getinstance().getfield();
this.add(tf);
}
}
---------------------------------------------------------------------------
=============《按你要求特意后改过的最简单功能的代码如下》========================
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class Counter2 {
public static void main(String[] args) {
CounterFrame frame = new CounterFrame();
frame.show();
}
}
class CounterFrame extends JFrame {
public CounterFrame() {
setTitle("计算器");
setSize(new Dimension(400, 280));
this.getContentPane().add(new Allpanel());
this.addWindowListener
(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
CounterFrame.this.windowClosed();
}
}
);
}
protected void windowClosed() {
System.exit(0);
}
}
class Tool {
public static Tool instance;
private JTextField field;
private Tool() {
this.field=new JTextField(30);
this.field.setHorizontalAlignment(JTextField.RIGHT);
}
public static Tool getinstance()
{
if(instance==null)
{
instance=new Tool();
}
return instance;
}
public JTextField getfield()
{
return (this.field);
}
}
class Allpanel extends JPanel {
public Allpanel() {
this.setLayout(new BorderLayout(0,7));
Northpanel np=new Northpanel();
Centerpanel cp=new Centerpanel();
this.add(np,BorderLayout.NORTH);
this.add(cp,BorderLayout.CENTER);
}
}
class Centercenter extends JPanel {
static Vector Vec=new Vector();
static Vector vc=new Vector();
static Vector vc1=new Vector();
static Vector vc2=new Vector();
static Vector vc3=new Vector();
static String begin="yes";
static double add;
static double jq;
static double cs;
static double cq;
static double dy;
static String jg;
static String what;
static double tool=0;
static String to="yes";
/**
* Method Centercenter
*
*
*/
public Centercenter() {
// TODO: Add your code here
final JTextField text=Tool.getinstance().getfield();
this.setLayout(new GridLayout(4,5,3,3));
String arg[] ={"7","8","9","/","4","5","6","*","1","2","3","-","0","=",".","+"};
for(int i=0;i16;i++)
{
final JButton b=new JButton(arg[i]);
//this.add(new JButton(arg[i]));
this.add(b);
if(i==0||i==1||i==2||i==4||i==5||i==6||i==8||i==9||i==10||i==12)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mark=b.getText();
String ma=text.getText();
if(vc3.contains("v3"))
{
text.setText("0."+mark);
vc3.clear();
}
else if(vc.contains("a"))
{
if(vc2.contains("v2"))
{
text.setText("0."+mark);
vc.clear();
vc2.clear();
}
else
{
text.setText(mark);
vc.clear();
Vec.clear();
Vec.add(mark);
}
}
else
{
text.setText(ma.trim()+mark);
Vec.add(mark);
}
begin="no";
to="yes";
}
});
}
if(i==14)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mar=b.getText();
String m=text.getText();
if("yes".equals(begin))
{
vc3.add("v3");
}
if(vc1.contains("v1"))
{
vc2.add("v2");
vc1.clear();
}
if(!Vec.contains(".")!vc.contains("a"))
{
text.setText(m.trim()+mar);
Vec.add(".");
}
}
});
}
if(i==15)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
add=Double.parseDouble(ma);
if(what==null)
{
tool=add;
what="add";
}
else
{
tool=tool+add;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="+";
}
});
}
if(i==11)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
jq=Double.parseDouble(ma);
if(what==null)
{
tool=jq;
what="jq";
}
else
{
tool=tool-jq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="-";
}
});
}
if(i==3)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cq=Double.parseDouble(ma);
if(what==null)
{
tool=cq;
what="cq";
}
else
{
tool=tool/cq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="/";
}
});
}
if(i==7)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cs=Double.parseDouble(ma);
if(what==null)
{
tool=cs;
what="cs";
}
else
{
tool=tool*cs;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="*";
}
});
}
if(i==13)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
dy=Double.parseDouble(ma);
if(what=="add")
{
jg=String.valueOf((tool+dy));
}
if(what=="jq")
{
jg=String.valueOf((tool-dy));
}
if(what=="cs")
{
jg=String.valueOf((tool*dy));
}
if(what=="cq")
{
jg=String.valueOf((tool/dy));
}
if(what==null)
{
if(to=="+")
{
tool=add;
jg=String.valueOf(tool+dy);
}
else if(to=="-")
{
tool=jq;
jg=String.valueOf(dy-tool);
}
else if(to=="*")
{
tool=cs;
jg=String.valueOf(dy*tool);
}
else if(to=="/")
{
tool=cq;
jg=String.valueOf(dy/tool);
}
else
{
jg=String.valueOf(dy);
}
}
text.setText(jg);
Vec.clear();
Vec.add(".");
vc.add("a");
vc1.add("v1");
what=null;
tool=0;
}
});
}
}
}
}
class Centernorth extends JPanel {
public Centernorth() {
final JTextField text=Tool.getinstance().getfield();
}
}
class Centerpanel extends JPanel {
public Centerpanel() {
this.setLayout(new BorderLayout(8,7));
Centernorth cn=new Centernorth();
Centercenter cc=new Centercenter();
Centerwest cw=new Centerwest();
this.add(cn,BorderLayout.NORTH);
this.add(cc,BorderLayout.CENTER);
this.add(cw,BorderLayout.WEST);
}
}
class Centerwest extends JPanel {
public Centerwest() {
}
}
class Northpanel extends JPanel {
private JTextField tf;
public Northpanel() {
tf=Tool.getinstance().getfield();
this.add(tf);
}
}
------------------------------------------------------------
才子_辉祝您愉快！
（java） 将一个自然数分解成几个质数的连乘积形式 举例 input：60 output：2*2*3*5
简单写一个方法
返回一个装了质因数的ArrayList
希望对楼主有所帮助，望采纳！
刚刚测了一下，有点错误，看来空手写还是容易出错啊。
给一个完整的
import java.util.ArrayList;
import java.util.List;
public class Test
{
public static void main(String args[])
{
ListInteger output = resolvePrime(60);
for (int i = 0 ; i output.size() - 1; i++) {
System.out.print(output.get(i) + " * ");
}
System.out.print(output.get(output.size() - 1));
}
public static ListInteger resolvePrime(int input) {
ListInteger output = new ArrayListInteger();
int currentPrime = 2; // 当前所除质数
while (input != 1) {
// 能整除当前质数，则在List中压入一次当前质数，并且更新input的值
if (input % currentPrime == 0) {
output.add(currentPrime);
input /= currentPrime;
}
// 若不能整除， 检查下一个质数
else {
for (int i = currentPrime + 1; i = input; i++) {
boolean isPrime = true;
for (int j = 2; j i / 2; j++) {
if (i % j == 0) {
isPrime = false;break;
}
}
if (isPrime) {
currentPrime = i;break;
}
}
}
}
return output;
}
}
【java】连加和连乘
import javax.swing.JOptionPane;
public class Total {
public static void main(String[] args) {
int m, n;
int sum = 0;
m = Integer.parseInt(JOptionPane.showInputDialog("请输入第一个值"));
n = Integer.parseInt(JOptionPane.showInputDialog("请输入第二个值"));
if (m = n) {
accu(m, n, sum);
} else {
accu(n, m, sum);
}
}
public static void accu(int m, int n, int sum) {
for (int i = n; i = m; i++) {
sum += i;
}
JOptionPane.showMessageDialog(null, n + "~" + m + "和为" + sum);
sum = 1;
for (int i = n; i = m; i++) {
sum *= i;
}
JOptionPane.showMessageDialog(null, n + "~" + m + "乘积为" + sum);
}
}
java一个简单的连乘问题！
public class exam9{
public static void main(String args[]){
if (args.length!=1) {
System.out.println("输入的参数个数不合法!");
System.out.println("例: java exam9 10");
return;
}
int n=0;
try {
n=Integer.parseInt(args[0]);
if (n1 || n12) {
System.out.println("请输入1~12之间的数!");
return;
}
} catch (NumberFormatException nfe) {
System.out.println("输入的参数不是合法整数!");
return;
}
int sum=1;
for (int i=1; i=n; i++) {
sum *= i;
}
System.out.println(sum);
}
}
java编程语言谁会，下面题目帮解答一下，要详细步骤啊…………谢谢 急急急求……
import java.util.Scanner;
/**
* 1、计算3、6、9的阶乘并输出结果。
*
*/
public class Factorial {
public int getFact(int n){//阶乘的数
int m = 1;
for(int i = 1; i = n; i++){//从1开始计算到n，也就是1*2*3...*n
m = m*i;
}
return m;
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入您要计算的阶乘数:");
int n = sc.nextInt();
System.out.println(new Factorial().getFact(n));
}
}
===================================
import java.util.Scanner;
/**
* 2、编写一个应用程序，求Fibonacci数列的前十个数。(Fibonacci数列的定义为：F1=F2=1,当n=3时，Fn＝Fn-1+Fn-2)
* 这个你可以再控制台输入前几个数，但是项数要少，否则运算慢
*/
public class Fei {
public int func(int n){
if(n==1){
return 1;
}else if(n1){ //如果n不为1,那么就继续调用该方法递归 1,1,2,3,5...
return func(n-1)+func(n-2);
}else if(n0){
System.out.println("输入数字不符合要求");
return -1;
}
return 0;
}
public static void main(String []args){
Fei f=new Fei();
Scanner input=new Scanner(System.in);
System.out.print("项数n最好在(0n40)之间，否则很慢:");
int num=input.nextInt();
System.out.println("第"+num+"项数为:"+f.func(num));
}
}
===========================================
import java.util.Scanner;
/**
* 从命令行中接收两个姓名字符串，按照“hello 姓名2 and 姓名1”的格式输出。
* 若输入的是“命令 Jerry Tom”则输出的是“hello Tom and Jerry”。
*/
public class Print {
public void getFormat(String format){
String formatArr[] = format.split(" "); //按空格将该字符串分成String数组
System.out.print("hello " + formatArr[0]);//打印第一个
for(int i = 1; i formatArr.length; i++){//循环打印
System.out.print(" and " + formatArr[i]);
}
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入您要的姓名的个数:");
int num = sc.nextInt();
StringBuilder builder = new StringBuilder();//定义一个可变字符串对象
for(int i = 1; i = num; i++){
System.out.println("请输入第"+i+"个人的姓名:");
String format = sc.next();
builder.append(format).append(" ");//每次接收一个字符串就拼上空格加进去
}
new Print().getFormat(builder.toString());//将可变字符串变为String类型
}
}
=========================================
六、简答题
JAVA中的参数传递全是以值传递的
public class s {
public static void main (String [] args) {
String aa = new String ("aa");
String bb = new String ("bb");
operate (aa,bb);
System.out.println(bb);
String cc = new String("cc");
String dd = new String("dd");
dd = cc;
System.out.println(dd);
}
static void operate(String x, String y){ //问题就是判断这传递的是什么
y = x;
}
//打印结果
//bb
//cc
//这样就能看明白了，首先看dd = cc; 将dd的引用指向了cc的对象在堆中的位置
//如果参数也是引用传递，operate方法里实际上就是bb=aa，那么应该打印aa才对
//结果只是传的值
}
java 1到100连乘
使用java.math.BigInteger类。这个类是用来处理大整数的，如果你需要大的浮点数，应该使用BigDecimal类。
下面是求n的阶乘的例子：
import java.math.BigInteger;
public class Test {
public static void main(String[] args) {
jieCheng(100);
}
public static void jieCheng(int n) {
BigInteger sum = BigInteger.valueOf(1);
for(int i = 1; i = n; i++) {
sum = sum.multiply(BigInteger.valueOf(i));
}
System.out.println(sum);
}
}
你需要看看帮助文档，来了解BigInteger类。multiply是乘法运算，当然该类还有加、减、除等运算方法。如果还有不明白的地方请留言。
java连乘的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java 连接、java连乘的信息别忘了在本站进行查找喔。
发布于：2022-12-04，除非注明，否则均为原创文章，转载请注明出处。