wrapper classes in java
Wrapper classes: classes that are dedicated to primitives
Byte, Short, Integer, Long, Float, Double, Character, Boolean
presented in "java.lang" package
AutoBoxing: converting primitive values to wrapper class
int a = 100;
Integer b = a // auto boxing
Unboxing: converting wrapper class value to primitives
Integer a = 100;
int b = a; // unboxing
int a = 100;
double b = a; // nonewrapper classes in java ebhor.com
public class CommandLineArguments {
public static void main(String[] args) {
int a = Integer.parseInt(args[0]);
int b = Integer.parseInt(args[1]);
int sum = a + b;
System.out.println("Sum is " + sum);
}
}Java wrapper classes
ArrayList<Integer> myNumbers = new ArrayList<Integer>(); // ValidJava wrapper classes
ArrayList<int> myNumbers = new ArrayList<int>(); // InvalidWrapper classes in java
public class WrapperClassExample
{
public static void main(String[] args)
{
// before java 5 version
int num = 70;
// we were converting explicitly like this
Integer i = Integer.valueOf(num);
// printing Integer object value explicitly
System.out.println(i);
// in java 5 version
// Autoboxing and unboxing feature was introduced
// now there is no need of explicit conversion
Integer i1 = num;
System.out.println(i1);
}
}Copyright © 2021 Codeinu
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