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- What are the states of the complete life cycle of a thread in Java?
- This article uses the Java Quick Start column to introduce the states of the thread life cycle for everyone to further understand. In a complete life cycle, it usually goes through five states: 1. New; 2. Ready; 3. Running; 4. Blocked; 5. Death.
- Javagetting Started 3495 2019-11-25 16:49:36
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- Detailed introduction to objects in java
- This article introduces the creation, use and clearing of objects in Java from the java zero-based introduction column. I hope it can help students in need. When a Java object is created, it first allocates memory space for the object, initializes the member variables, then performs explicit initialization, and finally executes the constructor method to initialize the object.
- Javagetting Started 2624 2019-11-25 16:36:55
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- Commonly used principles in java design patterns
- This article introduces the commonly used principles in Java design patterns from the Java introductory learning column. I hope it can help you. Commonly used principles include: 1. Single responsibility principle; 2. Interface isolation principle; 3. Dependency inversion principle; 4. Richter substitution principle; 5. Opening and closing principle; 6. Demeter's law; 7. Synthetic reuse principle.
- Javagetting Started 1670 2019-11-25 16:22:51
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- An in-depth introduction to the JVM memory data area
- This article introduces the knowledge of JVM memory data area from the java development introduction column to facilitate your understanding. JAVA programs run on virtual machines and require memory space when running. When the virtual machine executes the JAVA program, the memory it manages will be divided into different data areas for easy management.
- Javagetting Started 2789 2019-11-25 16:08:18
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- What does a container in java mean?
- This article introduces to you what the container in Java is from the Java language introduction column. I hope it can help you understand. A container in Java refers to a class specifically used to store objects of other classes. It is a whole that is formed by combining several class objects with the same or similar properties.
- Javagetting Started 4447 2019-11-25 15:56:18
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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.
- Javagetting Started 4043 2019-11-26 17:11:33
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- 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.
- Javagetting Started 2228 2019-11-25 15:44:02
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- 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.
- Javagetting Started 2665 2019-11-25 15:28:28
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- 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.
- Javagetting Started 3720 2019-11-25 15:01:23
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- 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.
- Javagetting Started 2691 2019-11-25 14:48:36
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- 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.
- Javagetting Started 2401 2019-11-25 14:13:39
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- 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()".
- Javagetting Started 3958 2019-11-25 13:47:16
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- 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.
- Javagetting Started 3453 2019-11-25 13:37:35
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- 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.
- Javagetting Started 3800 2019-11-25 13:06:04
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- 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.
- Javagetting Started 3904 2019-11-25 10:47:28
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