get set的时候报空指针异常

Question

getset方法
private String flieName;
public String getFlieName() {
return flieName;
}
public void setFlieName(String FlieName) {
this.flieName = FlieName;
}
调用set
f.setFlieName(UseProcess.intputName());
TestMain.test();
get的时候报空
int lastnum = getNum(f.getFlieName());

Exception in thread "main" java.lang.NullPointerException
at java.io.FileInputStream.<init>(FileInputStream.java:138)
at java.io.FileInputStream.<init>(FileInputStream.java:101)
at test.UseProcess.getNum(UseProcess.java:54)
at test.UseProcess.<init>(UseProcess.java:47)
at test.TestMain.test(TestMain.java:8)
at test.TestMain.main(TestMain.java:21)

Answer 1

这个嘛 ，给get和set打个断点看看就知道了吧