1. After consulting the online documentation for the class JOptionPane in the Java Class Library, describe the differences among the methods showConfirmDialog, showInputDialog, and showMessageDialog....

1. After consulting the online documentation for the class JOptionPane in the Java Class Library, describe the differences among the methods showConfirmDialog, showInputDialog, and showMessageDialog.

2. Given a Random object called rand, what does the call rand.nextDouble() return?

3. What do the following statements display?

System.out.println(Integer.parseInt("17"));

System.out.println(Integer.parseInt("17", 10));

System.out.println(Integer.parseInt("17", 16));