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POHow do I use both && and || in an if statement
 

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  1. POHow do I use both && and || in an if statement
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    <p>I'm working on a rock paper scissors gui application and I'm stuck on how I can get this to work. I found that in line 49 I get an illegal start of expression error. While I realize this is an assignment, I'm not sure what is triggering the error:</p> <pre><code>import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Rps extends JFrame implements ActionListener { private final char moves[] = {'R', 'P', 'S'}; private JRadioButton rock, paper, scissors; private JTextField display; public Rps() { super("Rock, paper, Scissors"); rock = new JRadioButton(" Rock ", true); paper = new JRadioButton(" Paper "); scissors = new JRadioButton(" Scissors "); ButtonGroup rpsButtons = new ButtonGroup(); rpsButtons.add(rock); rpsButtons.add(paper); rpsButtons.add(scissors); JButton go = new JButton(" Go "); go.addActionListener(this); display = new JTextField(25); display.setEditable(false); display.setBackground(Color.yellow); Container c = getContentPane(); c.setLayout(new FlowLayout()); c.add(rock); c.add(paper); c.add(scissors); c.add(go); c.add(display); } /** * returns -1 if the player wins, * 0 if it's a tie, and 1 if the computer wins */ private int nextPlay(char computerMove, char playerMove) { if (computerMove == 'R'&amp;&amp;playerMove == 'S'||computerMove=='S'&amp;&amp;playerMove==='P'||computerMove=='P'&amp;&amp;playerMove=='R'){ //Where I get the error int r = 1; return r; } else if (computerMove == 'R'&amp;&amp;playerMove == 'R'||computerMove=='S'&amp;&amp;playerMove=='S'||computerMove=='P'&amp;&amp;playerMove=='P'){ int r = 0; return r; } else if (computerMove == 'S'&amp;&amp;playerMove == 'R'||computerMove=='P'&amp;&amp;playerMove=='S'||computerMove=='R'&amp;&amp;playerMove=='P'){ int r = -1; return r; } </code></pre> <p>}</p> <pre><code>public void actionPerformed(ActionEvent e) { char playerMove, computerMove; if (rock.isSelected()) playerMove = 'R'; else if (paper.isSelected()) playerMove = 'P'; else if (scissors.isSelected()) playerMove = 'S'; int k = (int)(Math.random() * 3); computerMove = moves[k]; int result = nextPlay(computerMove, playerMove); String msg = " You said " + makeWord(playerMove) + ", I said " + makeWord(computerMove); if (result &lt; 0) msg += " -- you win."; else if (result == 0) msg += " -- tie."; else if (result &gt; 0) msg += " -- I win."; display.setText(msg); } private String makeWord(char move) { String word = ""; switch (move) { case 'R': word = "ROCK"; break; case 'P': word = "PAPER"; break; case 'S': word = "SCISSORS"; break; } return word; </code></pre> <p>}</p> <pre><code>public static void main(String[] args) { Rps window = new Rps(); window.setBounds(300, 300, 300, 140); window.setDefaultCloseOperation(EXIT_ON_CLOSE); window.setVisible(true); } </code></pre> <p>}</p>
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    1. COuse `==` instead of `=`
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    2. COThere is not need to define variable called `r`, assign to it and then return it. You can just use `return 1`.
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    3. COYou would do well to add parenthesis into your `if` condition to make it clearer exactly what conditions you're testing for. Also, as @nachokk pointed out, you need `==` not `=`
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