java.lang.IndexOutOfBoundsException: Index: 5, Size: 5解决

环境

Eclipse Indigo + Hibernate3.2 + Oracle 11g R2 + SQLPlus

 

问题

运行Hibernate程序，报如下异常

 

java.lang.IndexOutOfBoundsException: Index: 5, Size: 5at java.util.ArrayList.RangeCheck(ArrayList.java:547)at java.util.ArrayList.get(ArrayList.java:322)at com.addbook.dao.impl.ContactorDaoImpl.getAllContactorId(ContactorDaoImpl.java:123)at com.addbook.service.impl.ContactorServiceImpl.getAllContactorId(ContactorServiceImpl.java:81)at com.addbook.dao.impl.TestContactor.testGetAllContactorId(TestContactor.java:84)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)at java.lang.reflect.Method.invoke(Method.java:597)at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)at org.junit.runners.ParentRunner.run(ParentRunner.java:236)at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

 

 

解决

 

程序逻辑出错。

以前的程序：

 

@SuppressWarnings("unchecked")public List<Integer> getAllContactorId(){List<Integer> list = new ArrayList<Integer>();session = ConnUtil.getSession();sql = "select id from contactor";query = session.createSQLQuery(sql);list = query.list();for (int i = 0; i < list.size(); i++) {int temp = ((BigDecimal)query.list().get(i)).intValue();list.add(temp);}return list;}

 

修改后的程序：

 

@SuppressWarnings("unchecked")public List<Integer> getAllContactorId(){List<Integer> list = new ArrayList<Integer>();session = ConnUtil.getSession();sql = "select id from contactor";query = session.createSQLQuery(sql);list = query.list();System.out.println(list.size());int count = list.size();int num[] = new int[count];for (int i = 0; i < count; i++) {num[i] = ((BigDecimal)query.list().get(i)).intValue();}list = new ArrayList<Integer>();for (int i = 0; i < num.length; i++) {list.add(num[i]);}return list;}

 

问题分析

 

出现错误的原因：

 

1.      list.size()在不断的改变；

2.      list再次add会叠加以前的数据，所以需要重新创建对象。