是否可以在单个catch块中捕获多个Java异常？
例外是程序执行期间发生的问题（运行时错误）。发生异常时，程序会突然终止，并且生成异常的行之后的代码将永远不会执行。
代码中有多个异常
在Java7之前，只要我们有一个可能会生成多个异常的代码，并且如果您需要专门处理该代码，则应在一次尝试中使用多个catch块。
示例
以下Java程序包含一个数字数组（显示）。从用户那里，它接受此数组中的两个位置，然后将第一个位置的数字除以第二个位置的数字。
输入值时-
如果选择的位置不在显示的数组中，则抛出ArrayIndexOutOfBoundsException
如果选择0作为分母，则抛出ArithmeticException。
在此程序中，我们使用两个不同的catch块处理了所有可能的异常。
import java.util.Arrays;
import java.util.Scanner;
public class MultipleCatchBlocks {
public static void main(String [] args) {
Scanner sc = new Scanner(System.in);
int[] arr = {10, 20, 30, 2, 0, 8};
System.out.println("Enter 3 integer values one by one: ");
System.out.println("Array: "+Arrays.toString(arr));
System.out.println("Choose numerator and denominator (not 0) from this array
(enter positions 0 to 5)");
int a = sc.nextInt();
int b = sc.nextInt();
try {
int result = (arr[a])/(arr[b]);
System.out.println("Result of "+arr[a]+"/"+arr[b]+": "+result);
}
catch(ArrayIndexOutOfBoundsException e) {
System.out.println("Warning: You have chosen a position which is not in the array");
}
catch(ArithmeticException e) {
System.out.println("Warning: You cannot divide a number with 0");
}
}
}输出1
Enter 3 integer values one by one: Array: [10, 20, 30, 2, 0, 8] Choose numerator and denominator(not 0) from this array (enter positions 0 to 5) 2 8 Warning: You have chosen a position which is not in the array
输出2
Enter 3 integer values one by one: Array: [10, 20, 30, 2, 0, 8] Choose numerator and denominator (not 0) from this array (enter positions 0 to 5) 1 4 Warning: You cannot divide a number with 0
多捕获块
从Java7开始，使用此功能引入了Multicatch块，您可以在单个catch块中处理多个异常。
在此，您需要指定所有要处理的异常类，并用“||”分隔。”，如下所示-
catch(ArrayIndexOutOfBoundsException | ArithmeticException exp) {
System.out.println("Warning: Enter inputs as per instructions ");
}示例
以下Java程序演示了Multicatch的用法。在这里，我们在单个catch块中处理所有异常。
import java.util.Arrays;
import java.util.Scanner;
public class MultiCatch {
public static void main(String [] args) {
Scanner sc = new Scanner(System.in);
int[] arr = {10, 20, 30, 2, 0, 8};
System.out.println("Enter 3 integer values one by one: ");
System.out.println("Array: "+Arrays.toString(arr));
System.out.println("Choose numerator and denominator(not 0) from this array,
(enter positions 0 to 5)");
int a = sc.nextInt();
int b = sc.nextInt();
try {
int result = (arr[a])/(arr[b]);
System.out.println("Result of "+arr[a]+"/"+arr[b]+": "+result);
}
catch(ArrayIndexOutOfBoundsException | ArithmeticException exp) {
System.out.println("Warning: Enter inputs as per instructions ");
}
}
}输出1
Enter 3 integer values one by one: Array: [10, 20, 30, 2, 0, 8] Choose numerator and denominator(not 0) from this array, (enter positions 0 to 5) 0 9 Warning: Enter inputs as per instructions
输出2
Enter 3 integer values one by one: Array: [10, 20, 30, 2, 0, 8] Choose numerator and denominator(not 0) from this array, (enter positions 0 to 5) 2 4 Warning: Enter inputs as per instructions