Location>code7788 >text

The first day of self-study for Java development

Popularity：371 ℃/2025-02-11 21:26:11

Java Learning Log Day 01｜2025/2/11｜1 day in total

⏰ Today's study time 6 hours

Learning goals for the day

1. Understand JVM, JDK, JRE
2. Learn the basic use of Idea development tools
3. Basic syntax: operators, data types, variables, constants, control flows, methods

Core learning content

  • JVM：JVMIt is the abbreviation of Java Virtual Machine and is a virtual machine necessary to run Java programs. JDK is the implementation of JVM, and JRE is the running environment of JVM
  • Operators: arithmetic, relationship, logic, bit operations, assignment
  • Overload: Only care about the same method name and different parameter list
  • Data type: basic data type, wrapper class, string, array, reference data type
  • Variables: local variables, member variables, static variables
  • constant:finalModified variables
  • Control flow: if, switch, while, do while, for, break, continue, return

Learning results verification

package ;

 import ;

 public class Test {
     public static void main(String[] args) {
         Scanner sc = new Scanner();
         guess();

         // Determine whether a number is a prime number
         int n = ();
         (isPrime(n) ? "Prime" : "Not Prime");
     }
     /**
      * Number guessing game
      */
     public static void guess() {
         Scanner sc = new Scanner();
         int luckyNum = (int)(() * 100) + 1;
         while(true) {
             int guessNum = ();
             if(guessNum == luckyNum) {
                 ("You guessed it!");
                 break;
             }else if(guessNum > luckyNum) {
                 ("You guessed too high!");
             }else {
                 ("You guessed too low!");
             }
         }
     }
     /**
      * Determine whether a number is a prime number
      * @param n
      * @return
      */
     public static boolean isPrime(int n) {
         if(n < 2) return false;
         if(n == 2) return true;
         for(int i = 2; i < (n); i++) {
             if(n % i == 0) return false;
         }
         return true;
     }
 }

Reflection and questioning

I have had a certain basic C and C++ before and I learned very quickly, but I am still not very proficient in Java syntax and need to practice more.

Tomorrow's plan

1. Learn the use of arrays in Java
2. Master the basic concepts of object-oriented OOP: class, object, encapsulation, inheritance, polymorphism, etc.

💬 Interactive invitation
Looking forward to friends leaving messages to communicate →/tegou
Your collection/likes are my motivation to keep updating🔥
See you on Day 02!

<Previous Next>