JDK7之后，Java資源關閉新的語法：try-with-resources語句
傳統寫法代碼
public void readFile() throws FileNotFoundException {
FileReader fr = null;
BufferedReader br = null;
try{
fr = new FileReader("d:/input.txt");
br = new BufferedReader(fr);
String s = "";
while((s = br.readLine()) != null){
System.out.println(s);
}
} catch (IOException e) {
e.printStackTrace();
}finally {
try {
br.close();
fr.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
try with resource寫法
public void readFile() throws FileNotFoundException {
try(
FileReader fr = new FileReader("d:/input.txt");
BufferedReader br = new BufferedReader(fr)
){
String s = "";
while((s = br.readLine()) != null){
System.out.println(s);
}
} catch (IOException e) {
e.printStackTrace();
}
}
