Java data type and equals, = = Difference __java

For Java basic data types, please refer to the blog: http://blog.csdn.net/bingduanlbd/article/details/27790287 java data type

The Java language is statically typed (statical typed), in other words, the type of all variables and expressions is completely determined when compiled.

Because it is statical typed, the Java language is also strongly typed (strong typed). A strong type means that each variable has a type, each of which has a type, and each type is strictly defined, and the type limits what values the variable can hold and what the expression ultimately produces. It also limits the types of operations that these values can take and the specific ways in which they are manipulated. All assignment operations, whether explicit or passed through parameters in a method call, are checked for type compatibility. base type (primitive types): Includes Boolean type and numeric type (numeric types), numeric types to integral type (integer Types) and floating-point type (floating-point type) reference type (reference types):

equals, = = Difference 1. Basic Data Types

Apply a double equal sign (= =), compare their values, and compare the memory addresses. 2. Composite data type (Class)

When compared with (= =), compare their store address in memory, so unless the same object is new, their comparison result is true, otherwise the result is false after comparison.

Equals is to determine if the value of the memory space that two variables or instances point to is the same