試試......抓住......最後

try { ... } catch ( ... ) { ... } 控制結構用於處理異常 。

String age_input = "abc";
try {
    int age = Integer.parseInt(age_input);
    if (age >= 18) {
        System.out.println("You can vote!");
    } else {
        System.out.println("Sorry, you can't vote yet.");
    }
} catch (NumberFormatException ex) {
    System.err.println("Invalid input.  '" + age_input + "' is not a valid integer.");
}

這將列印：

輸入無效。 ‘abc’不是有效整數。

在 catch 之後可以新增 finally 子句。無論是否丟擲異常，都將始終執行 finally 子句。

try { ... } catch ( ... ) { ... } finally { ... }

String age_input = "abc";
try {
    int age = Integer.parseInt(age_input);
    if (age >= 18) {
        System.out.println("You can vote!");
    } else {
        System.out.println("Sorry, you can't vote yet.");
    }
} catch (NumberFormatException ex) {
    System.err.println("Invalid input.  '" + age_input + "' is not a valid integer.");
} finally {
    System.out.println("This code will always be run, even if an exception is thrown");
}

這將列印：

輸入無效。 ‘abc’不是有效整數。
即使丟擲異常，也始終會執行此程式碼