String constant pool:
String comparison function:
String commonly used methods:
String clipping function:
String clipping function:
Use the static keyword:
When to call the class static variable of type, you can use "class name. Variable names," Once a variable is defined as static type variable, then he would be out of a total new class of objects and common use
Static methods and static variables are the same use, should pay attention to inside static methods can not use non-static member variables
Static code block:
Static block of code is mainly used for a static class variable initial value
Some function array:
Some math functions:
