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- What is JVM? Where is it?
- The JVM is essentially a program that recognizes .class bytecode files, parses its instructions, and ultimately calls functions on the operating system. The JVM runs on the operating system and has no direct interaction with the hardware.
- Javagetting Started 3518 2020-08-05 16:47:29
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- Summary of java modifier knowledge points
- This article is from the Java introductory tutorial. It introduces the relevant knowledge of Java modifiers to everyone. It has certain reference value and I hope it can help everyone. Modifiers in Java are divided into class modifiers, field modifiers, and method modifiers.
- Javagetting Started 1991 2020-08-04 16:58:19
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- Examples to explain common methods of StringBuffer class
- The StringBuffer class is a reference data type that stores strings more efficiently than the String class. Commonly used methods are: 1. toString() method, convert to String type; 2. append() method, append string; 3. insert() method, insert string.
- Javagetting Started 4557 2020-08-04 16:37:48
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- What are the functions of generics in java
- The functions of generics: 1. Improve the type safety of Java programs; 2. Eliminate forced type conversion; 3. Bring possibilities for JVM optimization in future versions; 4. Better code reusability.
- Javagetting Started 4811 2020-08-04 16:24:32
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- Introduction to common methods of Object class
- Object is the parent class of all classes and the root class of the class hierarchy. All objects (including arrays) implement the methods of this class. All objects inherit directly or indirectly from the Object class.
- Javagetting Started 3341 2020-08-04 16:13:11
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- What is the difference between this and super in java?
- The difference between this and super in Java: 1. this accesses the attributes in this class. If this class does not have this attribute, it will continue to search from the parent class, and super accesses the attributes in the parent class; 2. this represents the current UI view, super The current object cannot be represented.
- Javagetting Started 4468 2020-08-03 16:55:44
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- How to use io stream to copy pictures in java
- This article is from the Java introductory tutorial. It introduces the method of using io stream to copy images. It has certain reference value and I hope it can help everyone. FileInputStream and FileOutputStream are used to read raw bytes.
- Javagetting Started 4791 2020-08-03 16:44:17
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- What is the connection between abstract classes and interfaces?
- The connection between abstract classes and interfaces: 1. Both can have abstract methods; 2. Neither can create objects directly; 3. Both of them rely on the existence of subclasses to make sense, and subclasses must implement all their abstract methods; 4. Both can Implement polymorphism.
- Javagetting Started 2732 2020-08-03 16:37:39
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- Java implements compressed images without changing the original image size
- This article introduces how to compress images in Java without changing the size of the original image. It has certain reference value and I hope it can help everyone.
- Javagetting Started 3228 2020-08-03 16:38:38
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- What is the role of encapsulation in java? What are the steps?
- This article is from the java introductory tutorial: the article introduces the role and steps of encapsulation, which has certain reference value. I hope it can help everyone. The functions of encapsulation: 1. Prevent incorrect modification of attributes; 2. Improve the reusability of programs; 3. Reduce the coupling between programs.
- Javagetting Started 4117 2020-08-01 17:03:18
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- What are the characteristics of String class in java
- The String class is final-modified and cannot be inherited; the underlying layer of the String class uses an array structure; once a String object is created, it cannot be modified. The underlying layer maintains a string constant pool for sharing.
- Javagetting Started 4736 2020-08-01 16:46:50
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- How to implement majority combination merging in java
- Merge rules: Take the fixed-length content from each array in order and merge it into a new array. The content will be deleted. If the row is less than the fixed length or is empty, the remaining content will be directly taken out and placed in the new array. In the new array, continue to the next line.
- Javagetting Started 3164 2020-08-01 16:38:52
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- How to handle exceptions in java
- Java introductory tutorial: This article introduces the method of handling exceptions, which has certain reference value. I hope it can help everyone. Exception handling is divided into: 1. Exception throwing; 2. Exception catching.
- Javagetting Started 2737 2020-07-31 16:11:44
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- How exceptions are generated in java
- When the program encounters an error code, an exception will automatically be generated and the program will terminate. You can also throw exceptions manually: [throw new exception class name ();]. Throw must be defined in the method body to throw an exception of type Throwable.
- Javagetting Started 2780 2020-07-31 16:04:03
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- What is the difference between Error and Exception in java
- Error is an error that the program should not catch and should be handled by the JVM. We cannot handle it. Exception is an error that the program should catch. Among all its subclasses, the RuntimeException class and its subclasses are processed. Other classes are called non-runtime exceptions.
- Javagetting Started 2733 2020-07-31 15:57:24
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