java character wrapper class

Java numberGenerally, when you need to use numbers, we usually use built-in data types, such as: Byte, int, long, double, and so on.For example: int i = 5000; float gpa = 13.65; byte mask = 0xaf; 1 2 3 1 2 3 However, in the actual development process, we often encounter situations where objects need to be used rather than built-in data types. To solve this problem, the

contains many commonly used methods, which are grouped into two categories. One is the method inherited from number, and the other is the unique method of this class.The method that inherits from number1. Remove the package class corresponding to the value of the series method, the return of the method is the wrapper class object corresponding to the truth of th

("+"); float Floatvalue=new float ("21");Boolean booleanvalues=new Boolean ("true");Incoming strings conform to basic type requirementsSuch as: The following incorrect wordingFloat floatvalue=new Float ("abc");2.3. The Third Kindpublic static type ValueOf (type value)Short Shorvalue=short.valuesof ((short)); Integer intvalue=integer.valuesof (+); Character charvalue=character.valueof (' x '); Boolean booleanvalue=boolean.valueof (true);public static

string from the end, and the subscript value is also the starting number(5) Replace (change, replace); T replaces the specified string(6) split (); Returns an array of split stringsExample: String stu1 = "Li Ming -20-Male";String stu[] = Stu1.split ("-");System.out.println (stu[1]); 20(7) Substring (start, end); Intercepts the specified length string, has no end value, and intercepts the end(8) toUpperCase (); lowercase to uppercase(9) toLowerCase (); Uppercase to lowercase(+) charAt (); Takes

Packing class Java is an object-oriented programming language, and the appearance of wrapper classes is a better embodiment of this idea. Second, the wrapper class as a class is a property has a method, the function i

Basic type wrapper classThere are 8 basic data types in Java, but this data is basic data, it is difficult to do complex operation. What do we do?In the actual program use, the user input data on the program interface is stored as a string type. In the program development, we need to convert the string data to the specified basic data type according to the requirement, such as the age needs to be converted

The Java language is an object-oriented language, but the basic data types in Java are not object-oriented, which in the actual use of a lot of inconvenience, in order to solve this shortcoming, in the design of the class for each basic data type to design a corresponding class to represent, The classes that correspond

Recently createdXiao DingdongAnd automatically run after the machine is started.Xiao DingdongSo I want to convert the Java class into a service to run it like tomcat.So I foundJava service wrapper.Here are some of the places I want to use. Change the Java class to the third method of the Windows NT Service (using

Packing classEverything in Java is an object, so many operations are for objects, and Java will automatically wrap the usual data types into objects of the corresponding classes.Support for automatic package and unpacking after jdk1.5Wrapper classes for common data typesPackingBoxing is the object that changes the base data type to the corresponding class.listnew ArrayList();//list的各种操作都是针对对象的list.add(5);//

Wrapper class, Math, date format processing Packing class Math:random (), round () Date format processing Java advocates that thought is everything, but our basic data type is not a class, that is, there is no object concept, and

http://blog.163.com/bt_q/blog/static/11926672920104902636829/The Java language is an object-oriented language, but the basic data types in Java are not object-oriented, which in the actual use of a lot of inconvenience, in order to solve this shortcoming, in the design of the class for each basic data type to design a corresponding