Java Swing Calculator计算器

短命女 2023-10-05 19:01 5阅读 0赞

import java.awt.BorderLayout;
    import java.awt.EventQueue;
    
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.border.EmptyBorder;
    import javax.swing.JTextField;
    import javax.swing.JButton;
    import java.awt.event.ActionListener;
    import java.text.DecimalFormat;
    import java.awt.event.ActionEvent;
    
    public class CalculatorUI extends JFrame {
    
    	private JPanel contentPane;
    	private JTextField textField;
    
    	/**
    	 * Launch the application.
    	 */
    	public static void main(String[] args) {
    		EventQueue.invokeLater(new Runnable() {
    			public void run() {
    				try {
    					CalculatorUI frame = new CalculatorUI();
    					frame.setVisible(true);
    				} catch (Exception e) {
    					e.printStackTrace();
    				}
    			}
    		});
    	}
    
    	/**
    	 * Create the frame.
    	 */
    	public CalculatorUI() {
    
    		DecimalFormat formater = new DecimalFormat("0.##########");
    		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		setBounds(100, 100, 441, 300);
    		contentPane = new JPanel();
    		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    		setContentPane(contentPane);
    		contentPane.setLayout(null);
    
    		textField = new JTextField();
    		textField.setBounds(10, 10, 401, 48);
    		contentPane.add(textField);
    		textField.setColumns(10);
    
    		JButton btnNewButton7 = new JButton("7");
    		btnNewButton7.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButton7.getText());
    
    				} else {
    					textField.setText(textField.getText() + btnNewButton7.getText());
    				}
    			}
    		});
    		btnNewButton7.setBounds(9, 111, 93, 23);
    		contentPane.add(btnNewButton7);
    
    		JButton btnNewButton8 = new JButton("8");
    		btnNewButton8.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButton8.getText());
    
    				} else {
    					textField.setText(textField.getText() + btnNewButton8.getText());
    				}
    			}
    		});
    		btnNewButton8.setBounds(112, 111, 93, 23);
    		contentPane.add(btnNewButton8);
    
    		JButton btnNewButton9 = new JButton("9");
    		btnNewButton9.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButton9.getText());
    
    				} else {
    					textField.setText(textField.getText() + btnNewButton9.getText());
    				}
    			}
    		});
    		btnNewButton9.setBounds(215, 111, 93, 23);
    		contentPane.add(btnNewButton9);
    
    		JButton btnNewButtondiv = new JButton("/");
    		btnNewButtondiv.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButtondiv.getText());
    
    				} else {
    					textField.setText(textField.getText() +" " + btnNewButtondiv.getText() +" ");
    				}
    			}
    		});
    		btnNewButtondiv.setBounds(318, 111, 93, 23);
    		contentPane.add(btnNewButtondiv);
    
    		JButton btnNewButton4 = new JButton("4");
    		btnNewButton4.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButton4.getText());
    
    				} else {
    					textField.setText(textField.getText() + btnNewButton4.getText());
    				}
    			}
    		});
    		btnNewButton4.setBounds(9, 149, 93, 23);
    		contentPane.add(btnNewButton4);
    
    		JButton btnNewButton5 = new JButton("5");
    		btnNewButton5.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButton5.getText());
    
    				} else {
    					textField.setText(textField.getText() + btnNewButton5.getText());
    				}
    			}
    		});
    		btnNewButton5.setBounds(112, 149, 93, 23);
    		contentPane.add(btnNewButton5);
    
    		JButton btnNewButton6 = new JButton("6");
    		btnNewButton6.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButton6.getText());
    
    				} else {
    					textField.setText(textField.getText() + btnNewButton6.getText());
    				}
    			}
    		});
    		btnNewButton6.setBounds(215, 149, 93, 23);
    		contentPane.add(btnNewButton6);
    
    		JButton btnNewButtonmul = new JButton("*");
    		btnNewButtonmul.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButtonmul.getText());
    
    				} else {
    					textField.setText(textField.getText()  +" "+ btnNewButtonmul.getText() +" ");
    				}
    			}
    		});
    		btnNewButtonmul.setBounds(318, 149, 93, 23);
    		contentPane.add(btnNewButtonmul);
    
    		JButton btnNewButton1 = new JButton("1");
    		btnNewButton1.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButton1.getText());
    
    				} else {
    					textField.setText(textField.getText() + btnNewButton1.getText());
    				}
    			}
    		});
    		btnNewButton1.setBounds(9, 187, 93, 23);
    		contentPane.add(btnNewButton1);
    
    		JButton btnNewButton2 = new JButton("2");
    		btnNewButton2.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButton2.getText());
    
    				} else {
    					textField.setText(textField.getText() + btnNewButton2.getText());
    				}
    			}
    		});
    		btnNewButton2.setBounds(112, 187, 93, 23);
    		contentPane.add(btnNewButton2);
    
    		JButton btnNewButton3 = new JButton("3");
    		btnNewButton3.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButton3.getText());
    
    				} else {
    					textField.setText(textField.getText() + btnNewButton3.getText());
    				}
    			}
    		});
    		btnNewButton3.setBounds(215, 187, 93, 23);
    		contentPane.add(btnNewButton3);
    
    		JButton btnNewButtonsub = new JButton("-");
    		btnNewButtonsub.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButtonsub.getText());
    
    				} else {
    					textField.setText(textField.getText()  +" "+ btnNewButtonsub.getText() +" ");
    				}
    			}
    		});
    		btnNewButtonsub.setBounds(318, 187, 93, 23);
    		contentPane.add(btnNewButtonsub);
    
    		JButton btnNewButton0 = new JButton("0");
    		btnNewButton0.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButton0.getText());
    
    				} else {
    					textField.setText(textField.getText() + btnNewButton0.getText());
    				}
    			}
    		});
    		btnNewButton0.setBounds(9, 228, 93, 23);
    		contentPane.add(btnNewButton0);
    
    		JButton btnNewButtondot = new JButton(".");
    		btnNewButtondot.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButtondot.getText());
    
    				} else {
    					textField.setText(textField.getText() + btnNewButtondot.getText());
    				}
    			}
    		});
    		btnNewButtondot.setBounds(112, 228, 93, 23);
    		contentPane.add(btnNewButtondot);
    
    		JButton btnNewButtonequal = new JButton("=");
    
    		btnNewButtonequal.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				Calculator evaluate = new Calculator();
    				System.out.println(textField.getText());
    				System.out.println(evaluate.checkInput(textField.getText()));
    
    				if (evaluate.checkInput(textField.getText())) {
    					
    
    					textField.setText(textField.getText() + " " +btnNewButtonequal.getText()
    							+" "+ formater.format(evaluate.readInput(textField.getText())));
    				} else
    					textField.setText(evaluate.getException());
    
    			}
    		});
    		btnNewButtonequal.setBounds(215, 228, 93, 23);
    		contentPane.add(btnNewButtonequal);
    
    		JButton btnNewButtonadd = new JButton("+");
    		btnNewButtonadd.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButtonadd.getText());
    
    				} else {
    					textField.setText(textField.getText() +" "+ btnNewButtonadd.getText()+" ");
    				}
    			}
    		});
    		btnNewButtonadd.setBounds(318, 228, 93, 23);
    		contentPane.add(btnNewButtonadd);
    
    		JButton btnNewButtonlbra = new JButton("(");
    		btnNewButtonlbra.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButtonlbra.getText());
    
    				} else {
    					textField.setText(textField.getText() +" "+ btnNewButtonlbra.getText()+" ");
    				}
    			}
    		});
    		btnNewButtonlbra.setBounds(9, 78, 93, 23);
    		contentPane.add(btnNewButtonlbra);
    
    		JButton btnNewButtonrbra = new JButton(")");
    		btnNewButtonrbra.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    					textField.setText(btnNewButtonrbra.getText());
    
    				} else {
    					textField.setText(textField.getText() +" "+ btnNewButtonrbra.getText()+" ");
    				}
    			}
    		});
    		btnNewButtonrbra.setBounds(112, 78, 93, 23);
    		contentPane.add(btnNewButtonrbra);
    
    		JButton btnNewButtonc = new JButton("C");
    		btnNewButtonc.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				textField.setText("");
    			}
    		});
    		btnNewButtonc.setBounds(215, 78, 93, 23);
    		contentPane.add(btnNewButtonc);
    
    		JButton btnNewButtonback = new JButton("<-");
    		btnNewButtonback.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {
    				if ("0".equals(textField.getText())) {
    
    				} else {
    					if (textField.getText().length() > 1) {
    						textField.setText(textField.getText().substring(0, textField.getText().length() - 1));
    					} else {
    						textField.setText("0");
    					}
    				}
    			}
    
    		});
    		btnNewButtonback.setBounds(318, 78, 93, 23);
    		contentPane.add(btnNewButtonback);
    	}
    }

import java.util.Stack;
    import java.util.Scanner;
    
    public class Calculator {
    	private String token = "";
    	private String exception = "";
    
    	public String getException() {
    		return exception;
    	}
    
    	public boolean checkInput(String in) {
    		int open = 0;
    		int closed = 0;
    		int opCount = 0;
    		int numCount = 0;
    		int sqrtCount = 0;
    		boolean valid = true;
    
    		Scanner reader = new Scanner(in);
    
    		while (reader.hasNext()) {
    			token = reader.next();
    			System.out.println(token);
    			if (token.equals("("))
    				open++;
    			if (token.equals(")"))
    				closed++;
    			if (isNumber(token))
    				numCount++;
    			if (isOperator(token))
    				opCount++;
    			if (token.equals("sqrt"))
    				sqrtCount++;
    		}
    
    		if (open != closed) {
    			valid = false;
    			exception = "Error: unbalanced parenthesis";
    		}
    
    		if (numCount <= opCount) {
    			valid = false;
    			exception = "Error: too many operators";
    		}
    
    		if (opCount == 0 && sqrtCount == 0) {
    			valid = false;
    			exception = "Error: no operator";
    		}
    		return valid;
    	}
    
    	public double readInput(String exp) {
    		Scanner input = new Scanner(exp);
    		Stack<Double> num = new Stack<Double>();
    		Stack<String> op = new Stack<String>();
    
    		while (input.hasNext()) {
    			token = input.next();
    			if (isNumber(token)) {
    				num.push(Double.parseDouble(token));
    			} else if (token.equals("(")) {
    				op.push(token);
    			} else if (token.equals(")")) {
    				while (!op.peek().equals("(")) {
    					if (op.peek().equals("sqrt")) {
    						num.push(Math.sqrt(num.pop()));
    						op.pop();
    					} else
    						num.push(evaluate(op.pop(), num.pop(), num.pop()));
    				}
    				op.pop();
    			} else {
    				while (!op.empty() && hasPrecedence(token, op.peek())) {
    					if (op.peek().equals("sqrt")) {
    						num.push(Math.sqrt(num.pop()));
    						op.pop();
    					} else
    						num.push(evaluate(op.pop(), num.pop(), num.pop()));
    				}
    				op.push(token);
    			}
    		}
    
    		while (!op.empty()) {
    			if (op.peek().equals("sqrt")) {
    				num.push(Math.sqrt(num.pop()));
    				op.pop();
    			} else
    				num.push(evaluate(op.pop(), num.pop(), num.pop()));
    		}
    		return num.pop();
    	}
    
    	private static boolean isNumber(String exp) {
    		if (exp.startsWith("-") && (exp.length() > 1))
    			return true;
    		else if (exp.startsWith("0"))
    			return true;
    		else if (exp.startsWith("1"))
    			return true;
    		else if (exp.startsWith("2"))
    			return true;
    		else if (exp.startsWith("3"))
    			return true;
    		else if (exp.startsWith("4"))
    			return true;
    		else if (exp.startsWith("5"))
    			return true;
    		else if (exp.startsWith("6"))
    			return true;
    		else if (exp.startsWith("7"))
    			return true;
    		else if (exp.startsWith("8"))
    			return true;
    		else if (exp.startsWith("9"))
    			return true;
    		else
    			return false;
    	}
    
    	private static boolean isOperator(String exp) {
    		if (exp.equals("+"))
    			return true;
    		else if (exp.equals("-"))
    			return true;
    		else if (exp.equals("*"))
    			return true;
    		else if (exp.equals("/"))
    			return true;
    		else if (exp.equals("^"))
    			return true;
    		else
    			return false;
    	}
    
    	private static boolean hasPrecedence(String op1, String op2) {
    		if (op2.equals("(") || op2.equals(")"))
    			return false;
    		if ((op1.equals("*") || op1.equals("/")) && (op2.equals("+") || op2.equals("-")))
    			return false;
    		if (op1.equals("^") && (op2.equals("/") || op2.equals("*")))
    			return false;
    		if (op1.equals("^") && (op2.equals("-") || op2.equals("+")))
    			return false;
    		if (op1.equals("sqrt") && (op2.equals("/") || op2.equals("*")))
    			return false;
    		if (op1.equals("sqrt") && (op2.equals("-") || op2.equals("+")))
    			return false;
    		else
    			return true;
    	}
    
    	private static double evaluate(String operation, double num2, double num1) {
    		if (operation.equals("+")) {
    			num1 = num1 + num2;
    		} else if (operation.equals("-")) {
    			num1 = num1 - num2;
    		} else if (operation.equals("*")) {
    			num1 = num1 * num2;
    		} else if (operation.equals("/")) {
    			num1 = num1 / num2;
    		} else if (operation.equals("^")) {
    			num1 = Math.pow(num1, num2);
    		}
    		return num1;
    	}
    }

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