强行改成 Gradle 项目

1. 添加 build.gradle

.classpath

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
-	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="output" path="bin"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8/"/>
+	<classpathentry kind="con" path="org.eclipse.buildship.core.gradleclasspathcontainer"/>
+	<classpathentry kind="output" path="bin/default"/>
 </classpath>

.gitignore

@@ -1 +1,2 @@
 /bin/
+/.gradle/

.project

@@ -10,8 +10,14 @@
 			<arguments>
 			</arguments>
 		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
 	</buildSpec>
 	<natures>
 		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
 	</natures>
 </projectDescription>

.settings/org.eclipse.buildship.core.prefs

@@ -0,0 +1,2 @@
+connection.project.dir=
+eclipse.preferences.version=1

build.gradle

@@ -0,0 +1,26 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java project to get you started.
+ * For more details take a look at the Java Quickstart chapter in the Gradle
+ * User Manual available at https://docs.gradle.org/5.2.1/userguide/tutorial_java_projects.html
+ */
+
+plugins {
+    // Apply the java plugin to add support for Java
+    id 'java'
+
+    // Apply the eclipse plugin
+    id 'eclipse'
+}
+
+repositories {
+    // Use jcenter for resolving your dependencies.
+    // You can declare any Maven/Ivy/file repository here.
+    jcenter()
+}
+
+dependencies {
+
+}
+