
What are the characteristics of java
The characteristics of Java include simplicity, object-oriented, distributed, robustness, security, platform independence and portability, multi-threading, dynamics, etc. Java can write desktop applications, Web applications, distributed systems and embedded systems Applications etc.
Oct 20, 2020 am 11:24 AM
How to convert string to number in java
Java method to convert string to number: [Integer.valueOf("12")]. If you want to convert numbers to strings, you can use the [String.valueOf(12)] method.
Oct 20, 2020 am 11:09 AM
What are the three forms of java annotations?
The three forms of java comments are: 1. Single-line comments, such as [//single-line comments]; 2. Multi-line comments, such as [/*multi-line comments*/]; 3. Document comments, such as [/**@ author*/].
Oct 20, 2020 am 10:53 AM
How to create an array in java
How to create an array in java: declare the array name to open up space and assign a value, such as [int[] arr; arr = new int[]{1,2,3, …};]. You can also specify the number of elements when declaring the array, and then assign values, such as [int[] arr1= new int[3];].
Oct 20, 2020 am 10:13 AM
How to intercept a string in java
How to intercept a string in java: You can use the substring() function, such as [s.substring(0,s.length() - 1)], which means to remove the last character in the string.
Oct 20, 2020 am 09:42 AM
What should I do if java prompts that the main class cannot be found or cannot be loaded?
Solution to the java prompt that the main class cannot be found or cannot be loaded: 1. Open the advanced system settings and enter the environment variable settings; 2. Create a new JAVA_HOME variable and set the jdk installation path; 3. Edit the PATH variable, add the path to the bin directory, and click [OK] That’s it.
Oct 20, 2020 am 09:28 AM
What are the naming rules for java identifiers?
The Java identifier naming rules are: 1. It must be composed of letters, numbers, underscores and dollar signs; 2. It cannot start with a number; 3. It cannot conflict with keywords; 4. It cannot conflict with the class name of the Java class library; 5. Meaningful names should be used.
Oct 20, 2020 am 09:17 AM
How to copy an array in java
Getting started with java: This article shares with you the method of copying an array, which has certain reference value. I hope it can help you.
Oct 19, 2020 pm 04:52 PM
What are the naming rules for variables in java
The naming rules for variables in Java are: 1. It must start with a letter, underscore, or dollar sign; 2. The variable name must be composed of letters, numbers, and underscores; 3. The variable name cannot conflict with the java keyword.
Oct 19, 2020 pm 04:27 PM
What is the difference between overloading and rewriting in java
The difference between overloading and rewriting in Java: 1. Overloading occurs in this class, and rewriting occurs between the parent class and the subclass; 2. The overloaded method names must be the same, and the overridden method names must be the same and return The value types must be the same; 3. The overloaded parameter list is different, and the overridden parameter list must be the same.
Oct 19, 2020 pm 03:25 PM
What is the usage of this keyword in java
Usage of this keyword in java: 1. Call the attributes in this class, that is, the member variables in the class; 2. Call other methods in this class; 3. Call other constructors in this class, which need to be placed in the The first line of the constructor method.
Oct 19, 2020 pm 03:03 PM
What is java mainly used for?
The main application areas of java: 1. Large websites; 2. Large enterprise-level applications; 3. E-government; 4. Games; 5. Embedded devices and consumer electronics; 6. Big data. Java is mainly divided into three parts: 1. javaSE; 2. javaME; 3. javaEE.
Oct 19, 2020 pm 02:39 PM
Introduction to five methods of traversing a map
This article shares five methods for traversing a map. I hope it can be helpful to everyone.
Oct 13, 2020 pm 05:10 PM
How to implement multi-threading in java
Getting started with java: This article introduces the methods and ideas for implementing multi-threading. It has certain reference value and I hope it can help everyone.
Sep 30, 2020 pm 03:56 PM
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