java運行異常的示例

NullPointerException:空指針異常類

示例：

package c;

public class Test {

public static void main(String[] args) {

tln(toUpper(null));

}

public static String toUpper(String str){

return perCase();

}

}

異常信息如下：Exception in thread "main" PointerException

at per()

at (:6)

ArrayIndexOutOfBoundsException：數組下標越界異常

示例：

package c;

public class Test {

public static void main(String[] args) {

int[] a = {0,1,2,3};

tln(a[4]);

}

}