package Unused_Variable; import java.util.logging.Logger; public class Unused_Variable { static final Logger log = Logger.getLogger("logger"); /* use badsource and badsink */ public void bad() { Integer data; /* POTENTIAL FLAW: Initialize, but do not use data */ data = 5; // bad 变量赋值后未使用 } public void good() { Integer data; /* POTENTIAL FLAW: Initialize, but do not use data */ data = 5; // good 变量赋值后未使用 /* FIX: Use data */ log.info("" + data); } }