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POHow do I ask "if there is an exception, then do this" java
 

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  1. POHow do I ask "if there is an exception, then do this" java
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    <p>I wanted to ask that if an exception occurs, then display a certain String in the textfield. When I try using a try, catch IOException, it gives me an error that cannot have a catch in the same body as a try. This should probably be done in the action performed method. </p> <p>GUI:</p> <pre><code>import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.ArrayList; public class GUI extends JFrame implements ActionListener { JPanel buttonPanel, topPanel, operationPanel; JTextField display = new JTextField(20); doMath math = new doMath(); String s = ""; String b= ""; //int counter; JButton Num1; JButton Num2; JButton Num3; JButton Num4; JButton Num5; JButton Num6; JButton Num7; JButton Num8; JButton Num9; JButton Num0; JButton Add; JButton Sub; JButton Mult; JButton Div; JButton Eq; JButton Clr; JButton Space; public GUI() { super("Calculator"); setSize(400,400); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel mainPanel = new JPanel(); mainPanel.setLayout(new GridLayout (2,1)); buttonPanel = new JPanel(); buttonPanel.setLayout(new GridLayout(5, 4)); buttonPanel.add(Num1 = new JButton("1")); buttonPanel.add(Num2 = new JButton("2")); buttonPanel.add(Num3 = new JButton("3")); buttonPanel.add(Num4 = new JButton("4")); buttonPanel.add(Num5 = new JButton("5")); buttonPanel.add(Num6 = new JButton("6")); buttonPanel.add(Num7 = new JButton("7")); buttonPanel.add(Num8 = new JButton("8")); buttonPanel.add(Num9 = new JButton("9")); buttonPanel.add(Num0 = new JButton("0")); buttonPanel.add(Clr = new JButton("C")); buttonPanel.add(Eq = new JButton("=")); buttonPanel.add(Add = new JButton("+")); buttonPanel.add(Sub = new JButton("-")); buttonPanel.add(Mult = new JButton("*")); buttonPanel.add(Div = new JButton("/")); buttonPanel.add(Space = new JButton("Space")); Num1.addActionListener(this); Num2.addActionListener(this); Num3.addActionListener(this); Num4.addActionListener(this); Num5.addActionListener(this); Num6.addActionListener(this); Num7.addActionListener(this); Num8.addActionListener(this); Num9.addActionListener(this); Num0.addActionListener(this); Clr.addActionListener(this); Eq.addActionListener(this); Add.addActionListener(this); Sub.addActionListener(this); Mult.addActionListener(this); Div.addActionListener(this); Space.addActionListener(this); topPanel = new JPanel(); topPanel.setLayout(new FlowLayout()); topPanel.add(display); add(mainPanel); mainPanel.add(topPanel, BorderLayout.NORTH); mainPanel.add(buttonPanel, BorderLayout.SOUTH); setVisible(true); } public void actionPerformed(ActionEvent e) { JButton source = (JButton)e.getSource(); String text = source.getText(); try{ if (text.equals("=")) { doMath math = new doMath(); b = b.replaceAll("\\s+", " "); int result = math.doMath1(b); String answer = ""+result; display.setText(answer); } else if(text.equals("Space")) { b+=" "; display.setText(b); } else if (text.equals("C")) { b = ""; display.setText(b); } else if (text.equals("+") || text.equals("-") || text.equals("*") || text.equals("/")) { b += (" "+(text)+ " "); display.setText(b); } else { b += (text); display.setText(b); } } catch(IOException o) {display.setText(b);} } } </code></pre>
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    1. USBig_Fan
    1. USBig_Fan
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    1. PO
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      1. POHow do I ask "if there is an exception, then do this" java
      1. This table or related slice is empty.
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    2. VO
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      1. POHow do I ask "if there is an exception, then do this" java
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    1. COPlease post the smallest complete snippet of code that causes the problem, and remove unnecessary whitespace so it's easier to read.
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      1. USAdam Liss
    2. COWhy would you implement your own Stack class instead of using the one in the API
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      1. USWoot4Moo
    3. COYour error is very strange. Could you please post exactly what syntax are you trying to use? Because try{...}catch(Exception e){...} should always work.
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      1. USApproachingDarknessFish
 

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