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  • Analysis on the use of Java recursive algorithm

    Analysis on the use of Java recursive algorithm

    A recursive algorithm is an algorithm that calls itself directly or indirectly. In computer programming, recursive algorithms are very effective in solving a large class of problems. It often makes the description of the algorithm concise and easy to unde
    2024-11-18
  • Example introduction to detailed explanation of Java strings

    Example introduction to detailed explanation of Java strings

    1. Create objects. For direct string constants in Java programs, the JVM will use a string pool to save them. When a string direct constant is used for the first time, the JVM will put it into the string pool for caching. Under normal circumstances, strin
    2024-11-18
  • Detailed introduction to the use of enumerations in java

    Detailed introduction to the use of enumerations in java

    Enumeration features 1. Use enum to define an enumeration class that inherits the java.lang.Enum class by default instead of the Object class. Among them, the java.lang.Enum class implements two interfaces, java.lang.Serializable and java.lang.Comparable.
    2024-11-18
  • How to use File class in java

    How to use File class in java

    The constructor copy code is as follows: public class FileDemo {public static void main(String[] args){//Constructor File(String pathname)File f1 =new File("c://abc//1.txt") ;//File(String parent,String child)File f2 =new File("c://abc&quot
    2024-11-18
  • Simple code example of java loop exercise

    Simple code example of java loop exercise

    ★Print the multiplication table copy code. The code is as follows: public class TestDemo {public static void main(String[] args){for(int b=1;b<10;b++){for(int a=1;a<= b;a++)System.out.print(a+"*"+b+"="+a*b+"/t");System.
    2024-11-18
  • Applications and methods of arrays in java

    Applications and methods of arrays in java

    1. The array reversal copy code is as follows: import java.util.Arrays; public class ArrayReverse {public static void main(String[] args){int[] arr ={1,2,3,4,5,6, 7,8,9};reverse(arr);}public static void reverse(int[] arr){for(int i=0;i<arr.length/2;i++
    2024-11-18
  • The use of "==" and equals methods in java

    The use of "==" and equals methods in java

    Copy the code as follows: public class equalsDemo {public static void main(String[] args){/*When using == to determine whether two variables are equal, if the two variables are variables of basic data types, and both are numerical values The type is, then
    2024-11-18
  • The use of Java object initialization sequence

    The use of Java object initialization sequence

    Single class: (static member variables & static initialization block) < (member variables & initialization block) < constructor copy code code is as follows: public class object initialization sequence {public static void main(String[] args)
    2024-11-18
  • Analysis of the difference between instanceof and getClass() in java

    Analysis of the difference between instanceof and getClass() in java

    class A { } class B extends A { } Object o1 = new A(); Object o2 = new B(); o1 instanceof A => true o1 instanceof B => false o2 instanceof A => true // <================ HERE o2 instanceof B => true o1.getClass().equals(A.class) => true
    2024-11-18
  • javz notes: Interesting use of static methods

    javz notes: Interesting use of static methods

    Copy the code as follows: import java.util.*;public class welcome {public static void main(String[] args){/** Test 1: Methods can't modify numeric parameters*/System.out.println("Testing tripleValue:");double percent = 10;System.out.println(
    2024-11-18
  • Application introduction to the initialization process of Java class variables and member variables

    Application introduction to the initialization process of Java class variables and member variables

    1. Class initialization For class initialization: Class initialization is generally only initialized once, and class initialization mainly initializes static member variables. The compilation of a class determines the initialization process of the class.
    2024-11-18
  • Solution to path problem when loading resource files in Java

    Solution to path problem when loading resource files in Java

    There are two commonly used methods for loading resource files: 1. Using ClassLoader. Speaking of this, I have to mention the classification of ClassLoader. There are three main types of ClassLoader built into Java. The first one is the root class loader
    2024-11-18
  • The difference between String and StringBuilder in java

    The difference between String and StringBuilder in java

    I believe that everyone has a good understanding of the difference between String and StringBuffer, but it is estimated that there are still many comrades who are not clear about the working principles of these two classes. Today I will review this concep
    2024-11-18
  • Analysis of the problem of subclass calling parent class construction method in Java

    Analysis of the problem of subclass calling parent class construction method in Java

    In Java, during the construction process of a subclass, the constructor of its parent class must be called. This is because when an inheritance relationship exists, the subclass must inherit the contents of the parent class. By what means? The answer is a
    2024-11-18
  • In-depth analysis of Java regular expressions

    In-depth analysis of Java regular expressions

    1. regex (regular expression): RegularExpressions (replacing StringTokenizer); a powerful tool for string processing; popular in Unix, Perl is even better using regex. Mainly used in string matching, search and replacement. For example: matching IP (range
    2024-11-18
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