"C".equals(returnType) || // char
"I".equals(returnType) || // int
"S".equals(returnType) || // short
"Z".equals(returnType) ) { // boolean
cb.iconst_0();
cb.ireturn();
} else if ("J".equals(returnType)) { // long
cb.lconst_0();
cb.lreturn();
} else if ("F".equals(returnType)) { // float
cb.fconst_0();