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Detailed introduction to the byte type in java

Java also provides a byte data type, which is a basic type. Java byte is processed as the smallest number, so its value range is defined as -128~127, which is signed byte. The following article mainly introduces you to the relevant information about the byte type in Java. Friends in need can refer to it.

Nov 25, 2019 pm 03:51 PM

byte type java

In-depth understanding of Lambda expressions and functional interfaces

Java8 is called the most changed version in the history of Java. It contains many important new features, the core of which is the addition of Lambda expressions and Stream API. Lambda adds missing functional programming features to Java, allowing us to treat functions as first-class citizens.

Nov 25, 2019 pm 03:44 PM

java java8 lambda functional programming

Deep copy and shallow copy of java object copy

This article introduces the deep copy and shallow copy of java objects from the java introductory tutorial column. To realize object copying, a "Cloneable" interface must be implemented, otherwise an exception will be generated. Basic data types can be directly copied shallowly, and variable data types need to be deeply copied.

Nov 25, 2019 pm 03:28 PM

java object Shallow copy deep copy

What is singleton pattern in java? What are the advantages?

This article introduces to you what is the singleton mode in Java and what are the advantages of this mode from the java introductory learning column. The singleton mode means that some classes have at most one instance object during the running of the program. The advantage is: reducing memory overhead and avoiding multiple occupation of resources.

Nov 25, 2019 pm 03:00 PM

java advantage Singleton pattern

Detailed introduction to java reflection mechanism

This article introduces the reflection mechanism in Java in detail from the Java Programming Introduction column, hoping to help students who do not understand this mechanism. The reflection mechanism in Java means that in the running state, for any class, all properties and methods of this class can be known; for any object, any of its methods and properties can be called.

Nov 25, 2019 pm 02:48 PM

java reflection mechanism

What is the encapsulation process of jdbc in java

This article introduces the jdbc encapsulation process from the java introductory column, hoping to help students who are learning java. The encapsulation process of jdbc: 1. Declare jdbc parameters and variables; 2. Load the driver; 3. Create connection objects and SQL commands; 4. Execute SQL commands; 5. Process the results and close the resource.

Nov 25, 2019 pm 02:13 PM

java jdbc

What are the construction methods of ArrayList in java?

Below, the Java zero-based entry column will introduce to you the construction methods of ArrayList. I hope it will be helpful to your learning. The construction methods of ArrayList are: 1. "ArrayList(int initialCapacity)"; 2. "ArrayList()".

Nov 25, 2019 pm 01:47 PM

arraylist java Construction method

What is the difference between ArrayList and general array in java? How efficient is it?

The following is a detailed introduction to the difference between ArrayList and general arrays in the Java Quick Start column. The implementation principle of ArrayList is actually an array (dynamic array). Compared with a general array, the capacity of ArrayList can grow dynamically.

Nov 25, 2019 pm 01:37 PM

arraylist java the difference efficiency array

How many bytes (bits) do each data type in java occupy?

The number of bytes each data type in "java" occupies is: "byte" type occupies 1 byte, "short" type occupies 2 bytes, "int" type occupies 4 bytes, and "long" " type occupies 8 bytes, "boolean" type occupies 1 byte, and "float" type occupies 4 bytes.

Nov 25, 2019 pm 01:06 PM

java byte type of data

Is null an object in java?

"null" in "java" itself is not an object, nor is it an "Object" instance, but "null" itself can be used to represent an undefined object, so "null" can be assigned to a reference type variable, but it absolutely cannot "null" can be assigned to a basic data type variable.

Nov 25, 2019 am 10:47 AM

java null object

Garbled characters appear when inserting Chinese data into mysql database in java

The solution to garbled characters when inserting Chinese data into the "mysql" database in "java" is: 1. Check the default character set of the database and the character set corresponding to "database"; 2. Set the default character set of the entire database to "utf" -8"; 3. Use "utf-8" encoding when specifying "JDBC" transmission.

Nov 25, 2019 am 10:32 AM

java mysql Chinese Garbled characters

How to classify IO streams in java

Below, the java introductory tutorial column will introduce to you how to classify IO in java. The IO stream can be divided into input stream and output stream according to the flow direction; it can be divided into node stream and function stream according to the function; it can be divided into byte stream and character stream according to the operation unit.

Nov 23, 2019 pm 06:14 PM

io java Classification

What are the methods to print one-dimensional array in java

The methods for printing one-dimensional arrays in "java" are: first, you can use the traditional "for" loop to print; second, you can use the "for each" loop to print; finally, you can call "Array" class " toString()" method prints a one-dimensional array.

Nov 23, 2019 pm 04:40 PM

java one-dimensional array Print method

Garbled characters are output in the java output statement

The reason why the "java" output statement outputs garbled characters is that the "java" file is saved using "UTF-8" encoding, while the "javac" file is processed using the computer system encoding when compiling the file. The solution is: first store the "java" file in "GBK" encoding, and then compile and run it.

Nov 23, 2019 pm 04:17 PM

java Garbled characters