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How to create a class in Java

The general format for creating a class in Java is: modifier class class name {member}. The modifier is optional, the class keyword must exist, the first letter of the class name must be capitalized, and the name must be based on camel case naming rules.

Nov 12, 2019 am 11:02 AM

java类创建

How to get the day of the week of the current date in java

How to get the day of the week of the current date in java: first create a getWeekOfDate function and receive a Date type parameter; then use the Calendar class inside the function to get the number of days in the week today; and finally subtract 1 from the number of days obtained.

Nov 12, 2019 am 10:57 AM

java获取日期

What are the basic data types in Java

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

Nov 12, 2019 am 10:44 AM

Java基本数据类型哪些

How to write the path of a file in java

How to get the file path: 1. Get the resource path "this.getClass().getResource("").getPath();"; 2. Get the file compilation path "this.getClass().getResource("/").getPath ();"etc.

Nov 12, 2019 am 10:38 AM

java获取文件路径

The difference between java static methods and non-static methods

The differences between Java static methods and non-static methods are: 1. Static methods are loaded into memory when the class is loaded and will not be automatically destroyed; 2. Non-static methods are allocated memory after instantiation and are destroyed after the instance is recycled; 3. Static methods Methods can be called using "class name. method name"; 4. Non-static methods need to create an instance first and then call it, etc.

Nov 12, 2019 am 10:24 AM

java静态方法区别

How to compare strings in java

Java provides us with compareTo, "==", and equals to compare strings, using equals() and ==. The difference is that equals compares whether the contents are equal, and == compares whether the referenced variable addresses are equal.

Nov 12, 2019 am 10:17 AM

java

what is java api

Java API is a standard class library provided by Java itself. For example, the "System.out.println()" printing function is a method implemented by Java itself. The api has detailed introductions to various classes, as well as various methods, including construction methods and common methods. Its essence is a dictionary of the Java language.

Nov 12, 2019 am 10:11 AM

javaapi

what is java instantiation

Java instantiation is the process of creating an object using the new keyword. For example, "new Persion()" means instantiating a Persion object. The brackets at the end of Persion mean that the constructor of the Persion class is immediately called for initialization.

Nov 12, 2019 am 09:55 AM

java实例化

How to debug java program in eclipse

The method of using eclipse to debug a Java program is: 1. Set a breakpoint at the location that needs to be debugged; 2. Click Debug; 3. Run the program; 4. Enter the debugging interface to view the information.

Nov 12, 2019 am 09:51 AM

eclipse调试java程序

what is java thread

A thread in Java refers to an instance of the java.lang.Thread class or the execution of a thread. You can use the java.lang.Thread or java.lang.Runnable interface to write code to define, instantiate, and start new threads.

Nov 12, 2019 am 09:40 AM

java线程

what is stream in java

Stream in Java is an abstract concept. When the program needs to read data from a certain data source, it will start a data stream. The data source can be a file, memory or network, etc.

Nov 12, 2019 am 09:21 AM

java

what is java exception handling

Java exception handling allows the program to handle exceptions in a targeted manner according to the code's preset exception handling logic when an exception occurs, so that the program can return to normal and continue execution as much as possible, while keeping the code clear.

Nov 12, 2019 am 09:19 AM

java异常处理

What exactly are enumerations in java?

Enumeration in Java is a special data type. The reason why it is special is that it is a class type but has more special constraints than types. However, the existence of these constraints also makes the enumeration type simple. , safety and convenience.

Nov 12, 2019 am 09:16 AM

java

What is thread pool in java

In Java, a thread pool is a form of multi-threading processing that adds tasks to a queue during processing and then automatically starts these tasks after the thread is created. Thread pool threads are background threads. Each thread uses the default stack size, runs at the default priority, and is in a multi-threaded apartment.

Nov 12, 2019 am 09:03 AM

java