Java:ArrayList.clear从传递给Map的ArrayList中删除元素

Question

这是我多年来第一次编写Java代码，我正在开发一个Ghidra脚本，该脚本将系统调用符号映射到其调用函数。

private HashMap<Symbol, Reference[]> symbolRefs = new HashMap<Symbol, Reference[]>();
private HashMap<Symbol, List<Function>> callerFuncs = new HashMap<Symbol, List<Function>>();
.
.
.
private void mapSysCallToCallerFunctions(FunctionManager funcMan) throws Exception {
List<Function> funcs = new ArrayList<Function>();
for(HashMap.Entry<Symbol, Reference[]> entry: this.symbolRefs.entrySet()) {
for(Reference ref : entry.getValue()) {
Function caller = funcMan.getFunctionContaining(ref.getFromAddress());
if(caller != null) {
funcs.add(caller);
}
}
this.callerFuncs.put(entry.getKey(), funcs);
funcs.clear();
}
}

我的问题是我想清除"funcs"列表，以便我可以在下一次迭代中再次使用空列表。这导致我的哈希图中的函数列表也为空，原因不明。如果我在这里打印我的哈希图：

private void printCallerSymbolMap() throws Exception {
for(HashMap.Entry<Symbol, List<Function>> entry: this.callerFuncs.entrySet()) {
printf("Symbol %s:n", entry.getKey().toString());
for(Function func : entry.getValue()) {
printf("Called by function %sn", func.getName());
}
}
}

我只是得到输出：

INFO  Symbol system: (GhidraScript)  
INFO  Symbol system: (GhidraScript) 

但是，当我删除funcs.clear((时，我得到：

INFO  Symbol system: (GhidraScript)  
INFO  Called by function system (GhidraScript)  
INFO  Called by function system (GhidraScript)  
INFO  Called by function main (GhidraScript)  
INFO  Symbol system: (GhidraScript)  
INFO  Called by function system (GhidraScript)  
INFO  Called by function system (GhidraScript)  
INFO  Called by function main (GhidraScript)  

不过应该是这样的：

INFO  Symbol system: (GhidraScript)  
INFO  Called by function system (GhidraScript)  
INFO  Called by function system (GhidraScript)  
INFO  Symbol system: (GhidraScript) 
INFO  Called by function main (GhidraScript)  

我有两个系统符号，因为它被扔了。

Answer 1

清除列表，每次初始化列表。

private void mapSysCallToCallerFunctions(FunctionManager funcMan) throws Exception {
List<Function> funcs;
for(HashMap.Entry<Symbol, Reference[]> entry: this.symbolRefs.entrySet()) {
funcs = new ArrayList<Function>();
for(Reference ref : entry.getValue()) {
Function caller = funcMan.getFunctionContaining(ref.getFromAddress());
if(caller != null) {
funcs.add(caller);
}
}
this.callerFuncs.put(entry.getKey(), funcs);
}
}