Conducted on April 5, 2018. Pleiades because it is troublesome. Pleiades All in One is for Japanese localization with Eclipse itself for Windows and Mac. This is a package of Pleiades plugins and useful plugins for each programming language.
Select Edition. This time, "Java" and "Full Edition".
Execute eclipse.exe of "D: \ pleiades \ eclipse".
Click "Start" without thinking about anything.
Click "File"-> "New"-> "Java Project".
Enter the project name appropriately and click "Finish". This time "project".
Since the project with the name entered in "7." has been created in the package explorer, Right-click "src" and click "New"-> "Class".
Enter the name field appropriately. This time "main". Check the "public static void main (String  args) (v) check box and click" Finish ".
A file with the name entered in "10." is created in Package Explorer, so double-click the file.
The contents of the file look like this.
Edit the code. (3rd and 9th lines)
Added to 3rd line import javax.swing.JOptionPane; Added to line 9 JOption Pane.showMessageDialog(null, "hello world");
Right-click on the file in Package Explorer. Click "Run"-> "Java Application".
A dialog is displayed.