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);
}
}
{
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: