The Java Tutorials have been written for JDK 8.Java教程是为JDK 8编写的。Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.本页中描述的示例和实践没有利用后续版本中引入的改进，并且可能使用不再可用的技术。See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.有关Java SE 9及其后续版本中更新的语言特性的摘要，请参阅Java语言更改。
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.有关所有JDK版本的新功能、增强功能以及已删除或不推荐的选项的信息，请参阅JDK发行说明。
The following quick reference summarizes the operators supported by the Java programming language.下面的快速参考总结了Java编程语言支持的运算符。
= Simple assignment operator
+ Additive operator (also used
for String concatenation)
- Subtraction operator
* Multiplication operator
/ Division operator
% Remainder operator+ Unary plus operator; indicates
positive value (numbers are
positive without this, however)
- Unary minus operator; negates
an expression
++ Increment operator; increments
a value by 1
-- Decrement operator; decrements
a value by 1
! Logical complement operator;
inverts the value of a boolean== Equal to != Not equal to > Greater than >= Greater than or equal to < Less than <= Less than or equal to
&& Conditional-AND
|| Conditional-OR
?: Ternary (shorthand for
if-then-else statement)instanceof Compares an object to
a specified type~ Unary bitwise complement << Signed left shift >> Signed right shift >>> Unsigned right shift & Bitwise AND ^ Bitwise exclusive OR | Bitwise inclusive OR