编译时 SequenceTest.java:24: variable fs1 might not have been initialized
SequenceInputStream s1 = new SequenceInputStream(fs1,fs2);
^
SequenceTest.java:24: variable fs2 might not have been initialized
SequenceInputStream s1 = new SequenceInputStream(fs1,fs2);
申明初始化 FileInputStream fs1=null,fs2=null;
SequenceInputStream s1 = new SequenceInputStream(fs1,fs2);
^
SequenceTest.java:24: variable fs2 might not have been initialized
SequenceInputStream s1 = new SequenceInputStream(fs1,fs2);
申明初始化 FileInputStream fs1=null,fs2=null;
FileInputStream fs1 = null,fs2 = null;
ok