您可以使用java编译一个类，然后获取asm打印出生成等效类所需的调用，
常问问题
ASMifierClassVisitor
ASMifierClassVisitor javadocs实际上包含了hello world代码，
import org.objectweb.asm.*;public class HelloDump implements Oppres { public static byte[] dump() throws Exception { ClassWriter cw = new ClassWriter(0); FieldVisitor fv; MethodVisitor mv; AnnotationVisitor av0; cw.visit(49, ACC_PUBLIC + ACC_SUPER, "Hello", null, "java/lang/Object", null); cw.visitSource("Hello.java", null); { mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null); mv.visitVarInsn(ALOAD, 0); mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V"); mv.visitInsn(RETURN); mv.visitMaxs(1, 1); mv.visitEnd(); } { mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null); mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;"); mv.visitLdcInsn("hello"); mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V"); mv.visitInsn(RETURN); mv.visitMaxs(2, 1); mv.visitEnd(); } cw.visitEnd(); return cw.toByteArray(); }}
