auto unboxing

Ext.: http://www.cnblogs.com/danne823/archive/2011/04/22/2025332.html What is automatic packing unpacking Automatic boxing (autoboxing), unpacking (unboxing) of the basic data type is a feature that has been available since J2SE

What is automatic packing unpacking Automatic boxing (autoboxing), unpacking (unboxing) of the basic data type is a feature that has been available since J2SE 5.0.Generally we want to create an object instance of a class, we do this:Class A =

Autoboxing and auto-unboxing of J2SE primitive types We know that in Java, the native type such as Int,long is not a class that inherits from object, so there are many operations that we cannot use primitive type operations, such as trying to put an

J2SE 1.5 provides the "autoboxing" and "auto-unboxing" mechanisms that allow compilers to automate the transformation between the base type and their wrapped objects, thus allowing for a simpler way to avoid some of the hassle of having two sets of

修正了所有已知的错误。增加了一份关于“Autoboxing/Auto-Unboxing”特性来源的背景资料。添加了一些关于“Autoboxing/Auto-Unboxing”特性增加了多少需要记住的规则的说明。/--> You can read from the following addresses: Http://blog.csdn.net/avius/archive/2004/07/29/55372.aspx Major

Basic data typesA primitive type, or a built-in type, is a special type that differs from the class in Java. They are the most frequently used types in our programming.Java is a strongly typed language, and the first declaration of a variable must

Test code:System.out.println (0L = = 0);//trueSystem.out.println (((Long) 0L). Equals (0));//falseInteger i1 = 100;Integer i2 = 100;Integer i3 = 1000;//if the int values between-128 and 127,VM use the same object, the new object is created.Integer i4

We all know that after JDK 5 introduced the mechanism of automatic disassembly box, this is a good thing to write code. Integer object comparison between -128~127 these old stems do not mention, their own look at the source code can be understood,

Introduction to new features in JDK5.0:generic type (generics);Enhanced "for" loops (enhanced for loop);Automatic packing/automatic unpacking (autoboxing/unboxing);Type safety enumeration (type safe enums);Static import (statically import);Variable

There are 8 basic types of data in Java:Integer type: Byte (8), short (16), int (32), Long (64)Float type: float (32), double (64)Character type: char (16-bit Unicode character)Boolean type: BooleanAuto-unboxing is supported after jdk1.5Auto-Boxing