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In Java, int is a primitive data type that is used to hold numeric values. for example an int variable can be used to hold your age in a Java program.
Integer is the Wrapper class for the int data type. In Java there are a lot of in built features that work only on objects. under such circumstances we can wrap the primitive data type in its wrapper and use it.
For example:
int x = 10;
Integer xObj = newInteger(x);
if you want to know the value contained in xObj, then we use the method intValue().
xObj.intValue() would return the value 10 contained in it.
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