我一直在查看代碼，并且已經嘗試使用資源。我之前使用過標準的try-catch語句，看起來它們在做同樣的事情。所以我的問題是“ 嘗試使用資源”與“嘗試捕獲 ”之間的區別是什么，哪個更好。這是嘗試使用資源：objects jar = new objects("brand");objects can= new objects("brand");try (FileOutputStream outStream = new FileOutputStream("people.bin")){ ObjectOutputStream stream = new ObjectOutputStream(outStream); stream.writeObject(jar); stream.writeObject(can); stream.close();} catch(FileNotFoundException e) { System.out.println("sorry it didn't work out");} catch(IOException f) { System.out.println("sorry it didn't work out");}
3 回答
楊魅力
TA貢獻1811條經驗 獲得超6個贊
你錯過了什么，finally街區。在try-with-resouces將使它像，
FileOutputStream outStream = null;
try {
outStream = new FileOutputStream("people.bin");
ObjectOutputStream stream = new ObjectOutputStream(outStream);
stream.writeObject(jar);
stream.writeObject(can);
stream.close();
} catch(FileNotFoundException e) {
System.out.println("sorry it didn't work out");
} catch(IOException f) {
System.out.println("sorry it didn't work out");
} finally {
if (outStream != null) {
try {
outStream.close();
} catch (Exception e) {
}
}
}
這意味著您確實想要這樣的東西（永遠不要吞下異常），
try (FileOutputStream outStream = new FileOutputStream("people.bin");
ObjectOutputStream stream = new ObjectOutputStream(outStream);) {
stream.writeObject(jar);
stream.writeObject(can);
// stream.close(); // <-- closed by try-with-resources.
} catch(FileNotFoundException e) {
System.out.println("sorry it didn't work out");
e.printStackTrace();
} catch(IOException f) {
System.out.println("sorry it didn't work out");
e.printStackTrace();
}
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