java编写计算器

最新推荐文章于 2022-11-17 15:21:49 发布
原创 最新推荐文章于 2022-11-17 15:21:49 发布 · 574 阅读 · 1 ·
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/*缺点：计算根号时只能计算一个数的，不能再表达式里面计算
                     不能一个输入符号，"-"除外
                     正能处理部分错误输入
      优点：键盘操作更爽啊， 可以用键盘输入部分功能
                      可以进行进制转换
                      文本框不可编辑，并且只接收数字和运算符避免误输入造成的错误
                      增加退格键，在用户输错是不必清空StingBuilder
                      在除法运算中当用户将除数输入成0时，会人性化的弹出错误提示
                      在求平方根时，如果被开方数为负数，会人性化的弹出错误提示
                     像普通计算器一样能在 在文本右边对其*/
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.*;

import java.util.*;
import java.util.concurrent.SynchronousQueue;

public class Cal extends JFrame
{
	JPanel tfPanel,btnPanel;
	JTextField tf;
	JButton btn0,btn1,btn2,btn3,btn4,btn5,btn6,btn7,btn8,btn9;
	JButton btnAdd,btnSub,btnMul,btnDiv,btnClr,btnEq,btnPoint,
			btnc,btng,btnz,btnb,btno,btnox,btnf;
	Font font,font1;
	
	StringBuilder strbuf;
	String str;
	Scanner sc;
	int calSymbol;
	
	Cal()
	{
		setTitle("计算器(标准)");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setLocation(650,300);
	
		font = new Font("微软雅黑",0,30);
		font1 = new Font("微软雅黑",0,50);
		tfPanel = new JPanel();
		tf = new JTextField("", 11);
		tf.setFont(font1);
		tf.setEditable(false);
		tf.setHorizontalAlignment(JTextField.RIGHT);
		tfPanel.add(tf);
		
		add(tfPanel,BorderLayout.NORTH);
	
		btnPanel = new JPanel();
		btn0 = new JButton("0");btn1 = new JButton("1");btn2 = new JButton("2");
		btn3 = new JButton("3");btn4 = new JButton("4");btn5 = new JButton("5");
		btn6 = new JButton("6");btn7 = new JButton("7");btn8 = new JButton("8");
		btn9 = new JButton("9");btnAdd = new JButton("+");btnSub = new JButton("-");
		btnMul = new JButton("*");btnDiv = new JButton("/");btnClr = new JButton("C");
		btnEq = new JButton("=");btnPoint = new JButton(".");btnc=new JButton("←");
		btng=new JButton("√");btnz=new JButton("±");btnb=new JButton("B");
		btno=new JButton("O");btnox=new JButton("OX");btnf=new JButton("1/x");
		
		btnEq.setBackground(Color.orange);
		
		btn0.setFont(font);btn1.setFont(font);btn2.setFont(font);btn3.setFont(font);
		btn4.setFont(font);btn5.setFont(font);btn6.setFont(font);btn7.setFont(font);
		btn8.setFont(font);btn9.setFont(font);btnAdd.setFont(font);btnSub.setFont(font);
		btnMul.setFont(font);btnDiv.setFont(font);btnClr.setFont(font);btnEq.setFont(font);
		btnPoint.setFont(font);btnc.setFont(font);btnz.setFont(font);btnb.setFont(font);
		btno.setFont(font);btnox.setFont(font);btnf.setFont(font);
	
		btnPanel.setLayout(new GridLayout(6,4));
		btnPanel.add(btnb);btnPanel.add(btno);btnPanel.add(btnox);btnPanel.add(btnf);
		btnPanel.add(btnClr);btnPanel.add(btnc);btnPanel.add(btnz);btnPanel.add(btnDiv);
		btnPanel.add(btn7);btnPanel.add(btn8);btnPanel.add(btn9);btnPanel.add(btnMul);
		btnPanel.add(btn4);btnPanel.add(btn5);btnPanel.add(btn6);btnPanel.add(btnSub);
		btnPanel.add(btn1);btnPanel.add(btn2);btnPanel.add(btn3);btnPanel.add(btnAdd);
		btnPanel.add(btng);btnPanel.add(btn0);btnPanel.add(btnPoint);btnPanel.add(btnEq);
		
		add(btnPanel,BorderLayout.CENTER);
		
		strbuf = new StringBuilder();
		
		pack();  //以其组建定义适合大小的窗口
		MyEvent();
	}
	
	private void tool0()
	{
		strbuf.append("0");
		str = strbuf.toString();
		tf.setText(str);
	}
	private void tool1()
	{
		strbuf.append("1");
		str = strbuf.toString();
		tf.setText(str);
	}
	private void tool2()
	{
		strbuf.append("2");
		str = strbuf.toString();
		tf.setText(str);
	}
	private void tool3()
	{
		strbuf.append("3");
		str = strbuf.toString();
		tf.setText(str);
	}
	private void tool4()
	{
		strbuf.append("4");
		str = strbuf.toString();
		tf.setText(str);
	}
	private void tool5()
	{
		strbuf.append("5");
		str = strbuf.toString();
		tf.setText(str);
	}
	private void tool6()
	{
		strbuf.append("6");
		str = strbuf.toString();
		tf.setText(str);
	}
	private void tool7()
	{
		strbuf.append("7");
		str = strbuf.toString();
		tf.setText(str);
	}
	private void tool8()
	{
		strbuf.append("8");
		str = strbuf.toString();
		tf.setText(str);
	}
	private void tool9()
	{
		strbuf.append("9");
		str = strbuf.toString();
		tf.setText(str);
	}
	private void toolpoint()
	{
		strbuf.append(".");
		str = strbuf.toString();
		tf.setText(str);
	}
	private void tooladd()
	{
		strbuf.append("+");
		str = strbuf.toString();
		tf.setText(str);
		calSymbol = 1;
	}
	private void toolsub()
	{
		strbuf.append("-");
		str = strbuf.toString();
		tf.setText(str);
		calSymbol = 2;
	}
	private void toolmul()
	{
		strbuf.append("*");
		str = strbuf.toString();
		tf.setText(str);
		calSymbol = 3;
	}
	private void tooldiv()
	{
		strbuf.append("/");
		str = strbuf.toString();
		tf.setText(str);
		calSymbol = 4;
	}
	private void toolb()
	{
		str=strbuf.toString();
		strbuf.delete(0,strbuf.length());
		strbuf.append(Integer.toBinaryString(Integer.parseInt(str)));
		str=strbuf.toString();
		tf.setText(str);
	}
	private void toolo()
	{
		str=strbuf.toString();
		strbuf.delete(0,strbuf.length());
		strbuf.append(Integer.toOctalString(Integer.parseInt(str)));
		str=strbuf.toString();
		tf.setText(str);
	}
	private void toolox()
	{
		str=strbuf.toString();
		strbuf.delete(0,strbuf.length());
		strbuf.append(Integer.toHexString(Integer.parseInt(str)));
		str=strbuf.toString();
		tf.setText(str);
	}
	private void toolz()
	{
		str=strbuf.toString();
		if(str.charAt(0) == '-')
		{
			strbuf.deleteCharAt(0);
			str=strbuf.toString();
		}
		else 
		{
			str="-"+strbuf.toString();
			strbuf.delete(0,strbuf.length());
			strbuf.append(str);
		}
		tf.setText(str);
	}
	private void toolclear()
	{
		strbuf.delete(0,strbuf.length());
		tf.setText("");
	}
	private void toolg()
	{
		str = strbuf.toString();
		strbuf.delete(0,strbuf.length());
		if(Double.parseDouble(str)<=0)
		{
			JOptionPane.showMessageDialog(null,"被开方数不能为负数！","标题",JOptionPane.ERROR_MESSAGE);
			strbuf.delete(0,strbuf.length());
			tf.setText("");
		}
		else
		{
			strbuf.append(Math.sqrt(Double.parseDouble(str)));
			str = strbuf.toString();
			tf.setText(str);
		}
	}
	private void toolf()
	{
		str = strbuf.toString();
		strbuf.delete(0,strbuf.length());
		if(Double.parseDouble(str)==0)
		{
			JOptionPane.showMessageDialog(null,"除数不能为0！","标题",JOptionPane.ERROR_MESSAGE);
			strbuf.delete(0,strbuf.length());
			tf.setText("");
		}
		else
		{
			strbuf.append(1/Double.parseDouble(str));
			str = strbuf.toString();
			tf.setText(str);
		}
	}
	private void toolentert()
	{
		str = strbuf.toString();
		if(str.isEmpty())
		{
			JOptionPane.showMessageDialog(null,"请合法输入！");
			strbuf.append("0+0");
			str=strbuf.toString();
		}
		char[] arr=str.toCharArray();
		int i;
		for(i=0;(arr[i]<'0'||arr[i]>'9')&&arr[i]!='-';i++);
		str=str.substring(i,str.length());
		sc = new Scanner(str);
		sc.useDelimiter("[+-]|[*]|[/]");
		
		double d1,d2,result=0;
		d1 = sc.nextDouble();
		d2 = sc.nextDouble();
		
		if(str.charAt(0) == '-')
			d1 = -d1;
		
		if(calSymbol == 1)
			result = d1+d2;
		else if(calSymbol == 2)
			result = d1-d2;
		else if(calSymbol == 3)
			result = d1*d2;
		else if(calSymbol == 4)
		{
			if(d2==0)
			{
				JOptionPane.showMessageDialog(null,"除数不能为0！","标题",JOptionPane.ERROR_MESSAGE);
				strbuf.delete(0,strbuf.length());
				tf.setText("");
			}
			else
				result = d1/d2;
		}
			
		strbuf.delete(0,strbuf.length());
		tf.setText(""+result);
		strbuf.append(result);
	}
	private void toolback()
	{
		strbuf.delete(strbuf.length()-1,strbuf.length());
		str=strbuf.toString();
		tf.setText(str);
	}
	private void MyEvent()
	{
		btn0.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				tool0();
		    }
		});
		btn1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				tool1();
		    }
		});
		btn2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				tool2();
		    }
		});
		btn3.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				tool3();
		    }
		});
		btn4.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				tool4();
		    }
		});
		btn5.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				tool5();
		    }
		});
		btn6.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				tool6();
		    }
		});
		btn7.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				tool7();
		    }
		});
		btn8.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				tool8();
		    }
		});
		btn9.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				tool9();
		    }
		});
		btnAdd.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				tooladd();
		    }
		});
		btnSub.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				toolsub();
		    }
		});
		btnMul.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				toolmul();
		    }
		});
		btnDiv.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				tooldiv();
		    }
		});
		btng.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				toolg();
		    }
		});
		btnf.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				toolf();
		    }
		});
		btnb.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				toolb();
		    }
		});
		btno.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				toolo();
		    }
		});
		btnox.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				toolox();
		    }
		});
		btnz.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				toolz();
		    }
		});
		btnPoint.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				toolpoint();
		    }
		});
		btnClr.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				toolclear();
		    }
		});
		btnc.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				toolback();
		    }
		});
		btnEq.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e)
			{
				toolentert();
		    }
		});
		
		tf.addKeyListener(new KeyAdapter() {
			public void keyPressed(KeyEvent e)
			{
				if(e.getKeyCode()==KeyEvent.VK_0)
					tool0();
				else if(e.getKeyCode()==KeyEvent.VK_1)
					tool1();
				else if(e.getKeyCode()==KeyEvent.VK_2)
					tool2();
				else if(e.getKeyCode()==KeyEvent.VK_3)
					tool3();
				else if(e.getKeyCode()==KeyEvent.VK_4)
					tool4();
				else if(e.getKeyCode()==KeyEvent.VK_5)
					tool5();
				else if(e.getKeyCode()==KeyEvent.VK_6)
					tool6();
				else if(e.getKeyCode()==KeyEvent.VK_7)
					tool7();
				else if(e.getKeyCode()==KeyEvent.VK_8)
					tool8();
				else if(e.getKeyCode()==KeyEvent.VK_9)
					tool9();
				else if(e.getKeyCode()==KeyEvent.VK_PERIOD)
					toolpoint();
				else if(e.getKeyCode()==KeyEvent.VK_BACK_SPACE)
					toolback();
				else if(e.getKeyCode()==KeyEvent.VK_ENTER)
					toolentert();
				else if(e.getKeyCode()==KeyEvent.VK_ADD)
					tooladd();
				else if(e.getKeyCode()==KeyEvent.VK_SUBTRACT)
					toolsub();
				else if(e.getKeyCode()==KeyEvent.VK_MULTIPLY)
					toolmul();
				else if(e.getKeyCode()==KeyEvent.VK_DIVIDE)
					tooldiv();
				else if(e.getKeyCode()==KeyEvent.VK_B)
					toolb();
				else if(e.getKeyCode()==KeyEvent.VK_O)
					toolo();
				else if(e.getKeyCode()==KeyEvent.VK_X)
					toolox();
				else if(e.getKeyCode()==KeyEvent.VK_C)
					toolclear();
				else if(e.getKeyCode()==KeyEvent.VK_G)
					toolg();
				else if(e.getKeyCode()==KeyEvent.VK_F)
					toolf();
				else if(e.getKeyCode()==KeyEvent.VK_Z)
					toolz();
				else if(e.getKeyCode()==KeyEvent.VK_ESCAPE)
					System.exit(0);
			}
		});
	}
	
	public static void main(String args[])
	{
		Cal frame = new Cal();
		frame.setVisible(true);
	}
}

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java 编写一个计算器
weixin_35750483的博客
12-19 1011
在 Java 中编写计算器可以使用以下步骤: 定义计算器类，并使用 main 方法来调用计算器的其他方法。 定义用于计算的方法，并将其设置为静态方法。 为计算器提供输入，可以使用 Scanner 类从控制台获取输入。 在输入中使用 switch 语句来处理不同的运算符，根据运算符进行计算并输出结果。 在计算过程中，可能会出现除 0 的情况，需要使用 try-catch 语句来处理异常。 ...
JAVA编写计算器
01-06
import java.awt.*;//导入AWT包import java.awt.event.*;//导入事件处理包import javax.swing.*;//继承一个类public class Untitled1extends Frame {//构造各种组件TextField t = new TextField(" ");TextField tt = new TextField(" ");Label l = new Label(" 我的计算器");Panel p = new Panel();Panel p1 = new Panel();Panel p2 = new Panel();Panel p3 = new Panel();Panel p4 = new Panel();Panel p5 = new Panel();Panel p6 = new Panel();Button bbb = new Button("EXIT");Button b0 = new Button("0");Button b1 = new Button("1");Button b2 = new Button("2");Button b3 = new Button("3");Button b4 = new Button("4");Button b5 = new Button("5");Button b6 = new Button("6");Button b7 = new Button("7");Button b8 = new Button("8");Button b9 = new Button("9");Button ba = new Button("+");Button bb = new Button("-");Button bc = new Button("*");Button bd = new Button("/");Button be = new Button(".");Button bg = new Button("sin");Button bh = new Button("cos");Button bi = new Button("tan");Button bj = new Button("sqrt");Button bk = new Button("CLEAR");Button bl = new Button("exp");Button bm = new Button("log");Button bn = new Button("abs");Button bf = new Button("=");//声明几个变量String s1, s2, s3;double u1, u2, u3;char op;//设置各种方法参数public Untitled1() {this.setTitle("我的计算器");this.setLayout(new GridLayout(7, 1, 5, 5));this.setBackground(Color.blue);t.setFont(new java.awt.Font("Dialog", 0, 30));l.setFont(new java.awt.Font("Dialog", 0, 30));tt.setFont(new java.awt.Font("Dialog", 0, 30));//为按钮和面板添加底色//添加面板this.add(p);this.add(p1);this.add(p2);this.add(p3);this.add(p4);this.add(p5);this.add(p6);//设置面板p.setLayout(new BorderLayout());p.add(l);p1.setLayout(new BorderLayout());p1.add(t);p2.setLayout(new GridLayout(1, 6, 5, 5));p3.setLayout(new GridLayout(1, 6, 5, 5));p4.setLayout(new GridLayout(1, 6, 5, 5));p5.setLayout(new GridLayout(1, 6, 5, 5));p6.setLayout(new GridLayout(1, 7, 5, 5));//添加按钮p2.add(b0);p2.add(b1);p2.add(b2);p2.add(b3);p2.add(bg);p2.add(bk);p3.add(b4);p3.add(b5);p3.add(b6);p3.add(b7);p3.add(bh);p3.add(bl);p4.add(b8);p4.add(b9);p4.add(ba);p4.add(bb);p4.add(bm);p4.add(bi);p5.add(bc);p5.add(bd);p5.add(be);p5.add(bf);p5.add(bj);p5.add(bn);p6.add(bbb);//添加各种监听器b0.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();s += "0";t.setText(s);}});b1.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();s += "1";t.setText(s);}});b2.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();s += "2";t.setText(s);}});b3.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();s += "3";t.setText(s);}});b4.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();s += "4";t.setText(s);}});b5.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();s += "5";t.setText(s);}});b6.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();s += "6";t.setText(s);}});b7.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();s += "7";t.setText(s);}});b8.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();s += "8";t.setText(s);}});b9.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();s += "9";t.setText(s);}});bg.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();double b = Double.parseDouble(s);b *= Math.PI / 180;b = Math.sin(b);b = b * 10000;b = Math.rint(b);b = b / 10000;t.setText("" + b);}});bh.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();double b = Double.parseDouble(s);b *= Math.PI / 180;b = Math.cos(b);b = b * 10000;b = Math.rint(b);b = b / 10000;t.setText("" + b);}});bi.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();double b = Double.parseDouble(s);b *= Math.PI / 180;b = Math.tan(b);b = b * 10000;b = Math.rint(b);b = b / 10000;t.setText("" + b);}});bl.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();double b = Double.parseDouble(s);b = Math.exp(b);b = b * 10000;b = Math.rint(b);b = b / 10000;t.setText("" + b);}});bj.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();double b = Double.parseDouble(s);b = Math.sqrt(b);b = b * 10000;b = Math.rint(b);b = b / 10000;t.setText("" + b);}});//开始设置功能键bm.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();double b = Double.parseDouble(s);b = Math.log(b);b = b * 10000;b = Math.rint(b);b = b / 10000;t.setText("" + b);}});bn.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();double b = Double.parseDouble(s);b = Math.abs(b);b = b * 10000;b = Math.rint(b);b = b / 10000;t.setText("" + b);}});bk.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();t.setText("");}});ba.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {s1 = t.getText();op = '+';t.setText("");}});bb.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {s1 = t.getText();op = '-';t.setText("");}});bc.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {s1 = t.getText();op = '*';t.setText("");}});bd.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {s1 = t.getText();op = '/';t.setText("");}});be.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s = t.getText();s += ".";t.setText(s);}});bf.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {s2 = t.getText();double u1 = Double.parseDouble(s1);double u2 = Double.parseDouble(s2);if (op == '+')u3 = u1 + u2;if (op == '-')u3 = u1 - u2;if (op == '*')u3 = u1 * u2;if (op == '/')u3 = u1 / u2;t.setText("" + u3);}});//添加退出按钮bbb.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {System.exit(0);}});}//设置主函数public static void main(String[] args) {Untitled1 w = new Untitled1();w.pack();w.show();}}
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