// LogicalOperatorsApplet.java (adopted from 5.19 LogicalOperators) // Demonstrating the logical operators // Java core packages import java.awt.*; // Java extension packages import javax.swing.*; public class LogicalOperatorsApplet extends JApplet{ public void init() { // get applet's content pane (GUI display area) Container container = getContentPane(); // create JTextArea to display results JTextArea outputArea = new JTextArea( 17, 20 ); // attach JTextArea to a JScrollPane so user can // scroll through results JScrollPane scroller = new JScrollPane( outputArea ); String output; container.add(scroller); // create truth table for && operator output = "Logical AND (&&)" + "\nfalse && false: " + ( false && false ) + "\nfalse && true: " + ( false && true ) + "\ntrue && false: " + ( true && false ) + "\ntrue && true: " + ( true && true ); // create truth table for || operator output += "\n\nLogical OR (||)" + "\nfalse || false: " + ( false || false ) + "\nfalse || true: " + ( false || true ) + "\ntrue || false: " + ( true || false ) + "\ntrue || true: " + ( true || true ); // create truth table for & operator output += "\n\nBoolean logical AND (&)" + "\nfalse & false: " + ( false & false ) + "\nfalse & true: " + ( false & true ) + "\ntrue & false: " + ( true & false ) + "\ntrue & true: " + ( true & true ); // create truth table for | operator output += "\n\nBoolean logical inclusive OR (|)" + "\nfalse | false: " + ( false | false ) + "\nfalse | true: " + ( false | true ) + "\ntrue | false: " + ( true | false ) + "\ntrue | true: " + ( true | true ); // create truth table for ^ operator output += "\n\nBoolean logical exclusive OR (^)" + "\nfalse ^ false: " + ( false ^ false ) + "\nfalse ^ true: " + ( false ^ true ) + "\ntrue ^ false: " + ( true ^ false ) + "\ntrue ^ true: " + ( true ^ true ); // create truth table for ! operator output += "\n\nLogical NOT (!)" + "\n!false: " + ( !false ) + "\n!true: " + ( !true ); outputArea.setText( output ); // place results in JTextArea } // end method init } // end class LogicalOperatorsApplet
// Fig. 5.19: LogicalOperators.java // Demonstrating the logical operators // Java extension packages import javax.swing.*; public class LogicalOperators { // main method begins execution of Java application public static void main( String args[] ) { // create JTextArea to display results JTextArea outputArea = new JTextArea( 17, 20 ); // attach JTextArea to a JScrollPane so user can // scroll through results JScrollPane scroller = new JScrollPane( outputArea ); String output; // create truth table for && operator output = "Logical AND (&&)" + "\nfalse && false: " + ( false && false ) + "\nfalse && true: " + ( false && true ) + "\ntrue && false: " + ( true && false ) + "\ntrue && true: " + ( true && true ); // create truth table for || operator output += "\n\nLogical OR (||)" + "\nfalse || false: " + ( false || false ) + "\nfalse || true: " + ( false || true ) + "\ntrue || false: " + ( true || false ) + "\ntrue || true: " + ( true || true ); // create truth table for & operator output += "\n\nBoolean logical AND (&)" + "\nfalse & false: " + ( false & false ) + "\nfalse & true: " + ( false & true ) + "\ntrue & false: " + ( true & false ) + "\ntrue & true: " + ( true & true ); // create truth table for | operator output += "\n\nBoolean logical inclusive OR (|)" + "\nfalse | false: " + ( false | false ) + "\nfalse | true: " + ( false | true ) + "\ntrue | false: " + ( true | false ) + "\ntrue | true: " + ( true | true ); // create truth table for ^ operator output += "\n\nBoolean logical exclusive OR (^)" + "\nfalse ^ false: " + ( false ^ false ) + "\nfalse ^ true: " + ( false ^ true ) + "\ntrue ^ false: " + ( true ^ false ) + "\ntrue ^ true: " + ( true ^ true ); // create truth table for ! operator output += "\n\nLogical NOT (!)" + "\n!false: " + ( !false ) + "\n!true: " + ( !true ); outputArea.setText( output ); // place results in JTextArea JOptionPane.showMessageDialog( null, scroller, "Truth Tables", JOptionPane.INFORMATION_MESSAGE ); System.exit( 0 ); // terminate application } // end method main } // end class LogicalOperators