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What are the loop statements in java

The loop statements in Java are: 1. while loop, the syntax structure is [while (Boolean expression) {loop content}]; 2. do...while loop, the syntax structure is [do{code statement}while (Boolean expression Mode);】.

May 31, 2020 pm 12:00 PM

java loop statement

What should I do if the javac command prompts that the file cannot be found?

The solution to the problem that the file cannot be found when executing the javac command is: 1. Enter the advanced setting options of the computer; 2. Uncheck the [Hide extensions for known file types] option; 3. Enter the directory where the java file is located; 4. Restart Just execute the javac command.

May 30, 2020 am 11:50 AM

javac document

What is the usage of toString() method in java

The usage of the toString() method in java is: return a Number object value represented by a string. The specific code is such as [Integer.toString(int i), which returns a String object representing the specified int.

May 25, 2020 pm 02:42 PM

java tostring()

How to define an interface in java

The way to define an interface in Java is: you can use the interface keyword to define the interface, the specific code is such as [public interface usb{}]. If we want to implement an interface, then we need to use the implements keyword.

May 25, 2020 am 11:38 AM

java interface

What is the creation process of java objects

The creation process of java objects is: 1. Class loading check; 2. Allocate memory, there are two methods: pointer collision and free list; 3. Initialize zero value, initialize the allocated memory space to zero value; 4. Set the object Header; 5. Execute the init method initialization.

May 25, 2020 am 09:59 AM

java object

What is method overriding in java

Method overriding in Java is also called rewriting, that is, the subclass redefines the method of the parent class. Things to note are: 1. The overridden method must have the same method name, parameter list, and return value type as the original method; 2. The overridden method cannot be of final type.

May 20, 2020 pm 04:58 PM

java method override

There are several types of streams in java

There are three types of streams in Java, which are: 1. Byte stream, including file byte stream and buffered byte stream; 2. Character stream, including file character stream and buffered character stream; 3. Convert streams, including InputStreamReader and OutputStreamWriter.

May 18, 2020 pm 05:22 PM

java flow

What is the difference between list and set in java

The difference between list and set in Java is: 1. The list method can allow duplicate objects, and the set method does not allow duplicate objects; 2. List can insert multiple null elements, and set only allows one null element to be inserted; 3. List is a An ordered container, the set method is an unordered container.

May 18, 2020 pm 05:01 PM

java list set

What is the difference between stack memory and heap memory in Java?

The difference between stack memory and heap memory in Java is: 1. Stack memory is used to store basic types of variables and reference variables, and heap memory is used to store objects in Java; 2. Variables stored in stack memory can only be stored in the thread to which they belong. Visible in , objects in heap memory are visible to all threads.

May 17, 2020 pm 03:21 PM

java Heap memory

What is the difference between jre and jdk in java

The difference between jre and jdk in java is: jre is the java running environment, including the java virtual machine and the core class libraries required by java programs; jdk is a development tool kit, which is provided to java developers and includes java Development tools also include jre.

May 17, 2020 pm 03:05 PM

java jdk jre

What is the difference between get and post in java

The difference between get and post in Java is: 1. Get obtains data from the server, and post transmits data to the server; 2. The amount of data transmitted by get is smaller, and the amount of data transmitted by post is larger; 3. Get is more secure. Low, post security is higher.

May 17, 2020 pm 02:47 PM

get java post

What web servers are there in java

The web servers in Java include: 1. Tomcat server, which is the first choice for beginners to learn to develop JSP applications; 2. Resin server, which is a very popular server that supports servlets and JSP; 3. JBoss server, which is a development source Code-based, pure java EJB server.

May 17, 2020 pm 02:38 PM

java web server

What is a singleton in javaweb

The singleton in javaweb means that all requests are processed with an object. For example, the objects in our commonly used service and dao layers are singletons. The reason why a singleton is used is because there is no need to create a new object for every request, because this wastes both CPU and memory.

May 17, 2020 pm 02:28 PM

javaweb Singleton

What is the difference between constructor methods and ordinary methods in java

The difference between constructors and ordinary methods in Java is: 1. The method name of the constructor must be exactly the same as the class name in which it is defined, and there is no return type; 2. There must be a constructor in a class, because the system will automatically add no parameters Construction method.

May 16, 2020 am 11:44 AM

java Construction method