Examples of org.ow2.asm.ClassVisitor.visitMethod()

org.ow2.asm.ClassVisitor.visitMethod()
Visits a method of the class. This method must return a new {@link MethodVisitor} instance (or null) each time it iscalled, i.e., it should not return a previously returned visitor. @param access the method's access flags (see {@link Opcodes}). This parameter also indicates if the method is synthetic and/or deprecated. @param name the method's name. @param desc the method's descriptor (see {@link Type Type}). @param signature the method's signature. May be null if themethod parameters, return type and exceptions do not use generic types. @param exceptions the internal names of the method's exception classes(see {@link Type#getInternalName() getInternalName}). May be null. @return an object to visit the byte code of the method, or nullif this class visitor is not interested in visiting the code of this method.

        // which inherits from Object
        ClassWriter cw = new ClassWriter(0);
        cw.visit(V1_1, ACC_PUBLIC, "Example", null, "java/lang/Object", null);


        // creates a MethodWriter for the (implicit) constructor
        MethodVisitor mw = cw.visitMethod(ACC_PUBLIC,
                "<init>",
                "()V",
                null,
                null);
        // pushes the 'this' variable

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        // this code uses a maximum of one stack element and one local variable
        mw.visitMaxs(1, 1);
        mw.visitEnd();


        // creates a MethodWriter for the 'main' method
        mw = cw.visitMethod(ACC_PUBLIC + ACC_STATIC,
                "main",
                "([Ljava/lang/String;)V",
                null,
                null);
        // pushes the 'out' field (of type PrintStream) of the System class

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        ClassWriter cw = new ClassWriter(0);
        MethodVisitor mv;
        cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, className, null, "java/lang/Object", null);


        // Constructor
        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
        mv.visitInsn(RETURN);
        mv.visitMaxs(1, 1);

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        mv.visitInsn(RETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();


        // hello method
        mv = cw.visitMethod(ACC_PUBLIC, "hello", "()Ljava/lang/String;", null, null);
        mv.visitCode();
        mv.visitLdcInsn(helloWorldString);
        mv.visitInsn(ARETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();

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