public native void printf_1(String a, Object b);
public native void printf_2(String a, Object b, Object c);
public native void printf_3(String a, Object b, Object c, Object d);
public native void printf_4(String a, Object b, Object c, Object d, Object e);
public native void printf_5(String a, Object b, Object c, Object d, Object e, Object f);
public native void printf_1(String a, Object b);
public native void printf_2(String a, Object b, Object c);
public native void printf_3(String a, Object b, Object c, Object d);
public native void printf_4(String a, Object b, Object c, Object d, Object e);
public native void printf_5(String a, Object b, Object c, Object d, Object e, Object f);