Using Abstract modifier, you can define an abstract class.
Example
String className = "Test";
TypeSpec.Builder classBuilder = TypeSpec.classBuilder(className);
classBuilder.addModifiers(Modifier.PUBLIC, Modifier.ABSTRACT);
classBuilder.addMethod(mainMethod);
TypeSpec helloWorldTypeSpec = classBuilder.build();
Find the below working application.
AbstractClassDemo.java
package com.sample.app;
import java.io.IOException;
import javax.lang.model.element.Modifier;
import com.squareup.javapoet.JavaFile;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeSpec;
public class AbstractClassDemo {
public static void main(String args[]) throws IOException {
MethodSpec.Builder methodBuilder = MethodSpec.methodBuilder("connect");
methodBuilder.addModifiers(Modifier.PUBLIC, Modifier.ABSTRACT);
methodBuilder.returns(void.class);
methodBuilder.addParameter(String[].class, "args");
MethodSpec mainMethod = methodBuilder.build();
String className = "Test";
TypeSpec.Builder classBuilder = TypeSpec.classBuilder(className);
classBuilder.addModifiers(Modifier.PUBLIC, Modifier.ABSTRACT);
classBuilder.addMethod(mainMethod);
TypeSpec helloWorldTypeSpec = classBuilder.build();
String packageName = "com.sample.app";
JavaFile javaFile = JavaFile.builder(packageName, helloWorldTypeSpec).build();
javaFile.writeTo(System.out);
}
}
Generated code
package com.sample.app;
import java.lang.String;
public abstract class Test {
public abstract void connect(String[] args);
}
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