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Variable Scope

Variable Scope. Brackets, brackets…. brackets. Variable Scope. /** * HelloWorld --- program that prints something to the screen. * @author Blanca Polo */ public class HelloWorld{ public static void main (String arg[ ]){ String s = “Hello World!!!”;

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Variable Scope

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  1. Variable Scope Brackets, brackets…. brackets

  2. Variable Scope /** * HelloWorld --- program that prints something to the screen. * @author Blanca Polo */ public class HelloWorld{ public static void main (String arg[ ]){ String s = “Hello World!!!”; System.out.println( s ); } }

  3. public class ParseI{ public static void main (String arg[ ])throws Exception{ InputStreamReader isr = new InputStreamReader(System.in); BufferedReader br = new BufferedReader(isr); int iNum = 0; String sUserInput = ""; System.out.println("Enter a number please "); sUserInput = br.readLine( ); System.out.println("You typed " + sUserInput); //risky code try{ iNum = Integer.parseInt(sUserInput); System.out.println("Thanks for the number!!! "); } catch(NumberFormatException nfe){ System.out.println("I asked for a number, dummy!!"); } System.out.println("- - - - the end - - - - "); } //main } // class VariableScope

  4. VarScope.java:22: cannot find symbol symbol : variable sUserInput location: class VarScope System.out.println("and you typed "+ sUserInput); ^ 1 error public class ParseI{ public static void main (String arg[ ])throws Exception{ InputStreamReader isr = new InputStreamReader(System.in); BufferedReader br = new BufferedReader(isr) //risky code try{ String sUserInput = ""; System.out.println("Enter a number please "); sUserInput = br.readLine( ); System.out.println("You typed " + sUserInput); int iNum = 0; iNum = Integer.parseInt(sUserInput); System.out.println("Thanks for the number!!! "); } catch(NumberFormatException nfe){ System.out.println("I asked for a number, dummy!!"); System.out.println(”and you typed “+ sUserInput); } System.out.println("- - - - the end - - - - "); } //main } // class VariableScope

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