java常见的运行时异常总结
发布时间：2011/1/5 10:27:34 来源：城市学习网 编辑：ziteng
总结了几个JAVA中常见的RuntimeException：
NullPointerException：空指针异常类
示例：
package com.darkmi.basic;
public class Test {
public static void main(String[] args) {
System.out.println(toUpper(null));
}
public static String toUpper(String str){
return str.toUpperCase();
}
}
异常信息如下：
Exception in thread "main" java.lang.NullPointerException
at com.darkmi.basic.Test.toUpper(Test.java:11)
at com.darkmi.basic.Test.main(Test.java:6)
ArrayIndexOutOfBoundsException：数组下标越界异常
示例：
package com.darkmi.basic;
public class Test {
public static void main(String[] args) {
int[] a = {0,1,2,3};
System.out.println(a[4]);
}
}
异常信息如下：
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
at com.darkmi.basic.Test.main(Test.java:7)
ArithmeticExecption：算术异常类：
示例：
package com.darkmi.basic;
public class Test {
public static void main(String[] args) {
int a = 10 / 0;
System.out.println(a);
}
}
异常信息如下：
Exception in thread "main" java.lang.ArithmeticException: / by zero
at com.darkmi.basic.Test.main(Test.java:6)
ClassCastException：类型强制转换异常
示例：
package com.darkmi.basic;
public class Test {
public static void main(String[] args) {
testParse("aaa");
}
public static void testParse(Object str){
Integer i = (Integer)str;
}
}
异常信息如下：
Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer
at com.darkmi.basic.Test.testParse(Test.java:10)
at com.darkmi.basic.Test.main(Test.java:6)
