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When to use this in java

In a general method, a formal parameter name in your method has the same name as a member of the current object. In order to avoid confusion, you need to explicitly use the this keyword to indicate that you want to use a certain For members, the usage method is "this. member name", and the one without this is the formal parameter.

Nov 11, 2019 am 09:04 AM

java

java installation steps

Java installation steps: 1. Download and install jdk; 2. Open the computer environment variable settings; 3. Add the jdk installation directory in JAVA_HOME; 4. Add JAVA variable values ????in Path; 5. Run java -version on the command line to test whether it is installed. success.

Nov 09, 2019 pm 05:25 PM

java installation steps

Determine whether the file exists java

How to determine whether a file exists in java: first use the new keyword to create a File object; then call the exists method on the object; finally, it can be judged based on the return value of the exists method. If the return value is true, the file exists.

Nov 09, 2019 pm 05:19 PM

java

The difference between java se and java ee

The difference between javase and javaee is: javaee is mostly used for enterprise-level development, including web development, etc., and is built on the basis of javase; javase can be regarded as a subset of javaee, allowing the development of java programs for desktop and server use.

Nov 09, 2019 pm 05:11 PM

javaee javase the difference

How to run java program

How to run a java program: 1. Create a new java file and write a simple output statement; 2. Open the command line and use "javac HelloJava.java" to compile and generate a class file; 3. Use "java HelloJava" to run it.

Nov 09, 2019 pm 05:05 PM

java

How to solve garbled code in java eclipse

The solution to garbled characters in the eclipse editor is: 1. Enter window in the menu bar and select the preferences option; 2. Open the general option and workspace option in sequence; 3. Change the encoding format to utf-8.

Nov 09, 2019 pm 04:42 PM

eclipse java Garbled characters solve

java what is gc

GC in java is the garbage collector. The GC function provided by Java can automatically detect whether the object exceeds the scope to achieve the purpose of automatically reclaiming memory. The Java language does not provide an explicit operation method to release allocated memory.

Nov 09, 2019 pm 02:13 PM

java

What data types does java have?

Java's basic data types are divided into four types: integer type, floating point type, character type, and Boolean type. Java's basic data types, also called built-in types, are data types provided by the Java language itself and are the basis for referencing other types.

Nov 09, 2019 pm 01:52 PM

java

what is java identifier

Java's identifier is a string starting with a letter, underscore (_) or dollar sign ($) and consisting of letters, numbers, underscore (_) or dollar sign ($). Identifiers are case-sensitive and have no limit on length.

Nov 09, 2019 pm 01:15 PM

java

what is java method

A Java method is a block of code that can be called repeatedly. The definition of a method includes two parts: method header and method body. The method header can consist of the method's type, name, parentheses after the name, and a list of parameters. The method body consists of a pair of brackets and the content between the brackets.

Nov 09, 2019 am 11:58 AM

java

What is method overloading in java

Java method overloading is in a class, the method name is the same, but the parameters are different. The return types can be the same or different. Each overloaded method (or constructor) must have a unique list of parameter types.

Nov 09, 2019 am 11:51 AM

java

what is java rewriting

Rewriting in Java means that the subclass rewrites the implementation process of the parent class's methods that allow access. Neither the return value nor the formal parameters can be changed. That is, the shell remains unchanged and the core is rewritten!

Nov 09, 2019 am 11:37 AM

java

what are java inner classes

A Java internal class is an independent class. After compilation, the internal class will be compiled into an independent .class file, but it will be preceded by the class name of the external class and the $ symbol. The inner class is a member of the outer class, so the inner class can freely access the member variables of the outer class, whether private or not.

Nov 09, 2019 am 11:24 AM

java

what is a package in java

Package is a package in Java. A package can be defined as a set of interconnected types (classes, interfaces, enumerations and annotations), providing access protection and namespace management functions for these types.

Nov 09, 2019 am 11:12 AM

java