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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.

Aug 04, 2020 pm 04:37 PM

stringbuffer Common methods

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.

Aug 04, 2020 pm 04:24 PM

java Generics

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.

Aug 04, 2020 pm 04:13 PM

object Common methods

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.

Aug 03, 2020 pm 04:55 PM

java super this

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.

Aug 03, 2020 pm 04:44 PM

I流 java picture

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.

Aug 03, 2020 pm 04:37 PM

abstract class interface

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.

Aug 03, 2020 pm 04:24 PM

java picture

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.

Aug 01, 2020 pm 05:03 PM

java encapsulation

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.

Aug 01, 2020 pm 04:46 PM

java string

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.

Aug 01, 2020 pm 04:38 PM

java

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.

Jul 31, 2020 pm 04:11 PM

java abnormal

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.

Jul 31, 2020 pm 04:04 PM

java abnormal

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.

Jul 31, 2020 pm 03:57 PM

error exception java

Is parameter passing in Java passed by value or by reference?

This article is from the Java introductory tutorial. It introduces the relevant knowledge of parameter passing in Java. It has certain reference value and I hope it can help everyone. All transfers in Java are by value, and all transfers of instance objects in Java are by reference.

Jul 30, 2020 pm 05:12 PM

java Pass by value pass by reference