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JavaBase

What are the classes that cannot be inherited in Java?

Classes marked final in Java are final classes and cannot be inherited, such as public, final, and String. When final is used to modify a class, it means that the class cannot be inherited.

Dec 26, 2019 pm 04:34 PM

java kind

How to implement delay in java

Methods to implement delay in java: 1. Use the Timer class to implement it. The schedule method of the Timer class can execute the program according to the time plan. 2. Use the Thread class, and ordinary delays can be implemented using the Thread.sleep(int) method.

Dec 26, 2019 pm 04:17 PM

java

Solution to Chinese garbled characters when running java using cmd

Solution to Chinese garbled characters when cmd runs java: 1. Use the "chcp 65001" command in cmd to set the cmd encoding to utf-8. 2. Specify the encoding method when executing java in cmd.

Dec 26, 2019 pm 03:32 PM

cmd java Garbled characters

How to determine whether strings are equal in java

How to determine whether strings are equal in Java: 1. Use "==" to determine whether strings are equal. 2. Use the equals method to determine whether strings are equal. The equals method cannot be used on variables of basic data types.

Dec 26, 2019 pm 02:57 PM

java string

The difference between java character stream and byte stream

The difference between java character stream and byte stream: 1. When reading and writing, one reads and writes by bytes, and the other reads and writes by characters. 2. The ones ending with stream are both byte streams, and the ones ending with reader and writer are both character streams.

Dec 26, 2019 pm 02:40 PM

java

What is an identifier in java

Identifiers in Java are names used by users when programming. They are used to name variables, constants, functions, statement blocks, etc. Java identifiers consist of numbers, letters and underscore (_), dollar sign ($).

Dec 26, 2019 pm 02:26 PM

java identifier

How to create a thread in java

How to create a thread in java: 1. Create a thread by inheriting the Thread class. 2. Create a thread by implementing the Runnable interface. 3. Use Callable and Future to create threads.

Dec 26, 2019 pm 02:11 PM

java thread

Several common exceptions in java

Several common exceptions in Java: 1. Null pointer exception class. 2. Data type conversion exception. 3. No access rights. 4. The parameters of the method are wrong. 5. Array subscript out-of-bounds exception. 6. File not found exception. 7. The specified class does not exist. 8. Instantiation exception.

Dec 26, 2019 pm 02:01 PM

java abnormal

Introduction to several states of java threads

The five major states of java threads are: creation state (New), ready state (Runnable), running state (Running), blocked state (Blocked), and death state (Dead).

Dec 26, 2019 pm 01:48 PM

java thread

How to sort java array

Java array sorting method: 1. Use Arrays.sort() to sort. The Arrays.sort() sorting method is the simplest and most commonly used sorting method in java. 2. Bubble sorting. 3. Select sorting. 4. Reverse sorting.

Dec 26, 2019 pm 01:34 PM

java array

How to implement serialization in java

Methods to implement serialization in java: 1. Use the Serializable interface to implement serialization. This interface is an iconic interface that marks this type of object as being serializable. 2. Use the Externalizable interface to implement serialization.

Dec 26, 2019 am 11:51 AM

java Serialization

What is a domain in java

Domains in Java are member variables in a class, which reflect the state of the class, and state changes are implemented by methods in the class body. Domains must be defined directly in the class body and cannot be included in method definitions.

Dec 26, 2019 am 11:37 AM

java

Detailed explanation of java concurrent programming

Java concurrent programming is the most difficult to understand but also the most important knowledge point in the entire Java development system. It is also the basis for the implementation of various concurrent components in various open source distributed frameworks. This article provides you with a detailed introduction to concurrent programming in Java, and I hope it will be of some help to you.

Dec 25, 2019 pm 05:12 PM

java

Causes and avoidance methods of garbled IO streams in Java

Reasons for garbled IO streams: 1. The encoding and decoding rules are inconsistent. 2. The character encoding does not support a certain language. Avoidance method: Use the byte[]getBytes() and String(byte[], bytes) methods for encoding and decoding respectively.

Dec 25, 2019 pm 04:58 PM

java Garbled characters