Test.java

package io.github.seggan.javaclasslib.tests;

import io.github.seggan.javaclasslib.ClassAccessFlags;
import io.github.seggan.javaclasslib.JavaClass;
import io.github.seggan.javaclasslib.attributes.code.CodeAttribute;
import io.github.seggan.javaclasslib.attributes.code.ExceptionsAttribute;
import io.github.seggan.javaclasslib.attributes.code.instructions.JvmInstructions;
import io.github.seggan.javaclasslib.constantpool.ClassEntry;
import io.github.seggan.javaclasslib.constantpool.UTF8Entry;
import io.github.seggan.javaclasslib.methods.Method;
import io.github.seggan.javaclasslib.methods.MethodAccessFlags;
import io.github.seggan.javaclasslib.util.JCLUtils;

import java.io.FileOutputStream;
import java.io.IOException;

public class Test {

    public static void main(String[] args) {

        JavaClass javaClass = new JavaClass("Testy", "java/lang/Object", 16);
        javaClass.setClassAccessFlags(ClassAccessFlags.PUBLIC, ClassAccessFlags.FINAL);

        Method main = new Method(new UTF8Entry(javaClass.getConstantPool(), "main"),
            new UTF8Entry(javaClass.getConstantPool(), JCLUtils.generateMethodSignature(Void.class, String[].class)));
        main.setAccessFlags(MethodAccessFlags.PUBLIC, MethodAccessFlags.STATIC);

        CodeAttribute code = new CodeAttribute(new UTF8Entry(javaClass.getConstantPool(), "Code"),
            2, 2,
            JvmInstructions.ALOAD.create(0)
        );

        main.getAttributes().add(code);

        ExceptionsAttribute exceptions = new ExceptionsAttribute(new UTF8Entry(javaClass.getConstantPool(), "Exceptions"),
            new ClassEntry(javaClass.getConstantPool(), "java/io/IOException")
        );

        main.getAttributes().add(exceptions);

        javaClass.getMethods().add(main);

        try (FileOutputStream outputStream = new FileOutputStream("Testy.class")) {
            javaClass.write(outputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}