Thinking in Java Fourth Edition Bruce Eckel Chapter 1 Exercise 9

Exercise 9: Write a program that demonstrates that autoboxing works for all the primitive types and their wrappers.

Solution:

public class AutoboxTest
{
    public static void main(String[] args)
    {
        boolean b = false;
        char c = 'x';
        byte t = 8;
        short s = 16;
        int i = 32;
        long l = 64;
        float f = 0.32f;
        double d = 0.64;
        Boolean B = b;
        System.out.println("boolean b = " + b);        
        System.out.println("Boolean B = " + B);
        Character C = c;
        System.out.println("char c = " + c);
        System.out.println("Character C = " + C);
        Byte T = t;
        System.out.println("byte t = " + t);
        System.out.println("Byte T = " + T);
        Short S = s;
        System.out.println("short s = " + s);
        System.out.println("Short S = " + S);
        Integer I = i;
        System.out.println("int i = " + i);
        System.out.println("Integer I = " + I);
        Long L = l;
        System.out.println("long l = " + l);
        System.out.println("Long L = " + L);
        Float F = f;
        System.out.println("float f = " + f);
        System.out.println("Float F = " + F);
        Double D = d;
        System.out.println("double d = " + d);
        System.out.println("Double D = " + D);     
    }
}

Output:

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