java_cheat_sheet_2 - HP JAVA Cheat Sheet INPUT with...

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HP JAVA Cheat Sheet INPUT with JOptionPane import javax.swing.*; public class TriangleArea { public static void main(String[] args) { String baseString,heightString; double base; // base of triangle. double height; // height of the triangle double area; // area of triangle baseString = JOptionPane.showInputDialog( "Enter base:" ); heightString = JOptionPane.showInputDialog( "Enter height:" ); base = Double.parseDouble( baseString ); height = Double.parseDouble( heightString ); area = ( .5 )*base*height; // Compute the area. JOptionPane.showMessageDialog( null , "The base was " + base + "The height was " + height + "The area of the triangle is " + area); } // end of main() } // end of class TriangleArea Java Primitives/Variables Integers int= -2,147,483,648 to 2,147,483,647 Real Numbers : Double = +10 38 (15 significant figures) Single Characters: Char letter=’A’; Boolean values (true or false) Boolean isPrime= true; String Values: String name = “Erin”; Arrays (see Java Array Class): int theArray[] = new int[10]; 1 dimensional int theArray[][]=new int[6][6]; 2 dimensional Standout Output Methods System.out.print(“Enter the score”); (same line) System.out.println(“Try again”); (new line) System.out.println(“The answer is “+ 42);
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This note was uploaded on 04/29/2010 for the course CS 5503 taught by Professor Kaylor during the Spring '10 term at W. Alabama.

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java_cheat_sheet_2 - HP JAVA Cheat Sheet INPUT with...

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