// Notice that we can't just have a random main() function hanging out
// in the middle of nowhere.  Every method must be attached to a
// class.  We get the effect of main() by defining a main method in a
// given class.
public class Examples {
    public static void main(String[] args) {
        // Demonstrates use of wrapper classes.
        char c = 'h';
        Character objectC = new Character(c);
        char d = objectC.charValue();
        
        String s = "hi";                // These two lines produce equivalent-valued
        String t = new String("hi");    // String objects.
        if("hi".equals(t))              // BTW, by convention the message
            System.out.println("eq0");  // .equals() means value comparison.

        if(t == "hi")                   // == is "object identity" testing.
            System.out.println("eq1");  // t and "hi" have the same value, but
        else                            // are different objects, so the identity
            System.out.println("not1"); // test will return false.


        // A demonstration of String concatenation, and implicit
        // toString() calls.
        Integer anInteger = new Integer(7);
        System.out.println("i = " + anInteger);
        // Above line and below line mean the same thing:
        System.out.println("i = " + anInteger.toString());
        
        // And Java creates implicit wrapper class instances for these...
        System.out.println("Other numbers are " + 5 + " and " + 2.1);
        System.out.println(2 + 3 + " = 1 + 4.");

        // An array of primitives: initialized to 0
        int[] intArr = new int[10];

        // An array of object references: initialized to null
        Integer[] fooArr = new Integer[10];
        for (int i = 0; i < fooArr.length; i++)
            fooArr[i] = new Integer(i);
    }
}