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: 5
	at 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 getAllContactorId(){
		List list = new ArrayList();
		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 getAllContactorId(){
		List list = new ArrayList();
		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();
		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。