So working on Learn Java the hard way. It explains what the integer datatype is. What if you need to have a decimal? Well, there is the double datatpye for that. What if you have a double and need it ...

The default type for integral literals in Java is int and the JVM will assume an integral literal is an int unless otherwise declared/cast ...

Hihow can i change an array list to integer or double?this is my code and i want show answer like a number and i use it not just print it ... How to Change Array List to Integer or Double in JAVA ...

Difference between int and Integer. The key difference between the Java int and Integer types is that an int simply represents a whole number, while an Integer has additional properties and methods.