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Can a java source file only have one public class?

A java source file can only have one public class. A Java source file can have multiple classes, but there can only be one public class, and the public class name must be consistent with the file name. There can be only non-public classes in a file. If there is only one non-public class, this class can be different from the file name.

Jul 08, 2020 pm 03:01 PM

java 源文件 public 类

Usage analysis of break and continue

break is used in switch statements to terminate the switch statement. When break is used in a loop, its function is to jump out of the loop. continue is used in loops to jump out of this loop and continue with the next loop.

Jul 07, 2020 pm 04:35 PM

break continue

Collection of classic Java interview questions (2)

Java introductory program: This article introduces some classic Java interview questions to you, I hope it will be helpful to you. What is the difference between Int and Integer? Integer is a wrapper class of Int, which is a basic data type of Java.

Jul 07, 2020 pm 04:19 PM

java 面试题

How to use the toString method in java

How to use the toString method in java: The toString() method is used to return a Number object value represented by a string. Syntax format: [String toString(int i)], returns a String object representing the specified int.

Jul 07, 2020 pm 03:24 PM

java toString

What are the eight basic data types in java

The eight basic data types in Java are: 1. Integer type, including byte, short, int, long; 2. Floating point type, including float, double; 3. Character type (char); 4. Boolean type.

Jul 07, 2020 pm 01:27 PM

java 基本数据类型

What is the difference between deep copy and shallow copy in java

Java introductory program: This article introduces the difference between deep copy and shallow copy in Java. It has certain reference value and I hope it can help everyone. Shallow copy only copies the object under consideration, while deep copy copies all the objects referenced by the copied object.

Jul 04, 2020 pm 04:58 PM

java 深复制浅复制

How to distinguish between the concepts of rewriting and overloading in Java

The difference between overwriting and overloading: 1. Overloading must have a different parameter list, and the overriding parameter list must be the same as the overridden method; 2. Overloading can have different return types, and the overriding return type must be the same as the overridden method. The return type of the overridden method is the same.

Jul 04, 2020 pm 04:48 PM

java 重写重载

What is the difference between the '==' operator and the equals method in Java?

The difference between the "==" operator and the equals method in Java is: the "==" operator is specially used to compare whether the values of two variables are the same; the equals method is used to compare whether the contents of two independent objects are the same. String comparisons basically use the equals method.

Jul 04, 2020 pm 04:37 PM

java == equals

What are the characteristics of stack memory and heap memory?

Java introductory program: This article introduces the characteristics of stack memory and heap memory, which has certain reference value. I hope it can help everyone. Stack memory characteristics: Each method is called will create a stack frame; Heap memory characteristics: Heap memory is a discontinuous space.

Jul 03, 2020 pm 04:30 PM

栈内存堆内存

What is the function of continue statement in loop statement?

The functions of the continue statement in the loop statement are: 1. End this loop, and subsequent statements in the loop body will not be executed; 2. Continue to judge the loop condition and execute the next statement in the loop body. The continue statement can only be used in a while statement, for statement or foreach statement.

Jul 03, 2020 pm 01:49 PM

continue 循环

Introduction to how to use the constructor

The biggest use of constructors is to perform initialization when creating objects. The constructor can change the default initialization of instance variables. When the system creates an object, it explicitly specifies the initial value for the instance variable of the object.

Jul 02, 2020 pm 05:03 PM

构造器

How to implement multi-threading by implementing the Runnable interface

This article comes from the java introductory program. This article introduces how to implement multi-threading by implementing the Runnable interface. It has certain reference value and I hope it can help everyone. If a common class implements the Runnable interface, then this common class also has multi-threaded operation capabilities.

Jul 01, 2020 pm 04:50 PM

Runnable接口多线程

How to achieve encapsulation?

Methods to achieve encapsulation: 1. privatize variables through private to limit the methods of class attributes; 2. set the external access interface for each attribute through set and get methods, and the outside world needs to use public methods to change the attributes of the class; 3. Create an instance of the wrapper class.

Jun 30, 2020 pm 05:17 PM

封装

How to install jdk14 under linux system

The method to install jdk14 under Linux system is: 1. Decompress the jdk compressed file; 2. Edit the /etc/profile file and write the environment variables; 3. Execute the [source /etc/profile] command to save; 4. Execute [java -version ] command to check whether the configuration is correct.

Jun 29, 2020 pm 05:24 PM

linux jdk14