20145239 experiment with familiarity with a Java development environment (Windows + idea)

Experiment with the familiar (Windows + idea) experimental content of a Java development environment

1. Compile and run a simple Java program using the JDK;
2. Edit, compile, run, and debug Java programs using Eclipse.

Experimental knowledge points

1.JVM, JRE, JDK installation location and difference;
2. command line run JAVAC;JAVA;JAVAC-CP; JAVA-CP;
The setting method and application of 3.path,classpath,sourcepath;
4. Package management: package;import;javac-d;
5.Eclipse (Netbeans) manages Java projects, debugging: Breakpoints, single step execution, etc.;
6.Java basic syntax: type and type conversion; variables; operators; Process control, etc.;
The use of 7.JDK help documents.

Experimental steps

• Simple use of the command line

1. Enter CMD to open the command line, locate the C drive, enter mkdir 20145239 to create a new folder, open and continue to enter mkdir EXP1 and then create a folder:

2. Enter javac-d. Helloworld.java compile and enter Java HelloWorld run:

• Debugging Java programs with idea

1. File->New->Project Create a new Java project in the idea by following these steps:

2. From the Run menu, select Run ... Options to run:

• Practice

1. Practice Title: Achieve the function of all prime numbers between the 1-n integers and test them.

2. Design code:

ImportJava.util.Scanner; Public class the Public Static voidMain (string[] args) {Scanner Scanner=NewScanner (system.in); System.out.println ("Please enter the maximum value of the range to query the number of primes:"); intN =Scanner.nextint (); intm = 0;intJ;  for(inti = 2; I <= N; i++){            intK = (int) math.sqrt (i);  for(j = 2; J <= K; j + +)                if(I%j = = 0)                     Break; if(J >k) {System.out.printf ("%4d", i); M++; if(M = = 5) {System.out.println (); M= 0; }            }        }    }}

3.IDEA Operation Result:

4. Command line Run Result:

The problem in the experiment and the solution process

Issue : The following error occurred while running at the command line:

solution : Return to the check code and find that one less line is written:

import Java.util.Scanner;

PSP (Personal software Process) time

Steps	Time Consuming	percentage
Demand analysis	5min	5%
Design	20min	20%
Code implementation	60min	60%
Test	5min	5%
Analysis Summary	10min	10%

Other (sentiment, thinking, etc., optional)

The need to get a little surprise, because once C language has done similar experiments, so there is a certain way of thinking. However, it is important to note the differences between Java and C languages.

Resources

• Java Learning Notes (8th Edition)
• Java Learning Note (8th Edition) Learning Guide
• Experiment with familiarity with a Java development environment

20145239 experiment with familiarity with a Java development environment (Windows + idea)