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preface *** reference material: Deep understanding of String in Java 1, Analysis of the underlying source code of String class Let's take a look at the source code of the String class: public final class String implements java.io.Serializable, Comparable<String>, CharSequence { /** The value is used for character storage ...

1. Letter guessing game 1. Randomly generate 5 letters - > character array2. Users guess letters - > console guess - > character array3. Compare the two character arrays, the correct number of letters and the correct number of positions4. The user guesses wrong and repeats 2 and 3 package day04.game; import java.util.Arrays; import ...

Comparison between Comparable and Comparator in Java Introduction to Comparable Comparable is a sort interface. If a class implements the Comparable interface, it means that "this class supports sorting". That is, classes that implement the Comparable interface support sorting. Assuming that there is a "List (or array) o ...

1, String String: string constant. The length of the string is immutable. In Java, string is immutable The underlying code of String is a char array decorated with final. After defining a String variable, the content of the variable is immutable We can view the source code as follows: public final class String implements java.io.Seriali ...

catalogue 1, Abstract class 1. Concept 2. Grammar rules 3. Some precautions 4. Role of abstract classes 2, Interface 1. Elaboration 2. Grammar rules 3. Some writing standards 4. Implement multiple interfaces 5. Inheritance between interfaces 6. Interface usage examples 7.Clonable interface and deep copy 8. Differences between inte ...

⭐ Preface ⭐ ️ 🍉 Blog home page: 🍁 [warm the sun like the wind]🍁 🍉 Boutique Java column [Javase],[Java data structure] 🍉 Welcome to like 👍 Collection ⭐ Message comments 📝 Private letters must be answered 😁 🍉 This article was originally written by [Rufeng Wenyang], and was first launched in CSDN 🙉 🍉 Bloggers will continue ...

Basic exception handling syntax and procedures The error handling mechanism in Java refers to non compiled errors, that is, non syntax errors. Similar to the division by zero error, that is, you can't divide by 0 during division. Java will encounter the following errors: example: system out. println(16 / 0); The ArithmeticException here is ...

The previously learned sequence table query is very fast, and the time complexity is O(1), but the efficiency of addition, deletion and modification is very low, because each addition, deletion and modification will move the elements. You can use another storage method - chain storage structure. Linked list is a non continuous and non sequenti ...

There are two kinds of lock objects: Class object and Class template object 1. Under standard conditions, two threads and one object, print and send text messages or call first? send message 2. After setting the SMS method with a delay of 4 seconds, two threads and one object print and send SMS or call first? send message The object of the ...

catalogue 1, Preliminary understanding of classes and objects 2, Member of class  1. field 2. Method 3.static keyword 3, Encapsulation 1. What is encapsulation 2.private implementation encapsulation 3.getter and setter methods 4, Construction method 5, Code block 6, Supplement 1.toString method:  2. Anonymous object 1, ...