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java运行常见异常举例
下面小编为大家总结了几个JAVA中常见的RuntimeException,希望对你们有所帮助:
NullPointerException:空指针异常类
示例1:
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2:
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3:
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4:
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)
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