Javapoet: Define inner class

Step 1: Define a class specification.

TypeSpec innerClass = TypeSpec.classBuilder("InnerClass").build();

Step 2: Add this class specification to the parent class.

TypeSpec parentClass = TypeSpec.classBuilder(className).addType(innerClass)
				.addModifiers(Modifier.PUBLIC, Modifier.FINAL).build();

Find the below working application.

 

InnerClassDemo.java

package com.sample.app;

import java.io.IOException;

import javax.lang.model.element.Modifier;

import com.squareup.javapoet.JavaFile;
import com.squareup.javapoet.TypeSpec;

public class InnerClassDemo {

	public static void main(String args[]) throws IOException {

		String className = "Test";
		TypeSpec innerClass = TypeSpec.classBuilder("InnerClass").build();
		TypeSpec parentClass = TypeSpec.classBuilder(className).addType(innerClass)
				.addModifiers(Modifier.PUBLIC, Modifier.FINAL).build();

		String packageName = "com.sample.app";
		JavaFile javaFile = JavaFile.builder(packageName, parentClass).build();

		javaFile.writeTo(System.out);
	}

}

Generated code

package com.sample.app;

public final class Test {
  static class InnerClass {
  }
}

 

 

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