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114 Part II: Writing Your Own Java Programs Listing 5-4: Checking Username and Password import static java.lang.System.out; import java.util.Scanner; class Authenticator { public static void main(String args[]) { Scanner myScanner = new Scanner(System.in); out.print( Username: ); String username = myScanner.next(); out.print( Password: ); String password = myScanner.next(); if ( (username.equals( bburd ) && password.equals( swordfish )) || (username.equals( hritter ) && password.equals( preakston )) ) { out.println( You re in. ); } else { out.println( You re suspicious. ); } } } Figure 5-5: Using logical operators. Keep an eye on those parentheses! When you re combining comparisons with logical operators, it s better to waste typing effort and add unneeded parentheses than to goof up your result by using too few parentheses. Take, for example, the expression 2 < 5 || 100 < 6 && 27 < 1 By misreading this expression, you may come to the conclusion that the expression is false. That is, you could wrongly read the expression as meaning (something-or-other) && 27 < 1. Because 27 < 1 is false, you would
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