I'm trying to learn constructor injection with collections. My Question class as below.
public class Question {
private int id;
private String name;
private List<String> answers;
public Question() {}
public Question(int id, String name, List<String> answers) {
super();
this.id = id;
this.name = name;
this.answers = answers;
}
public void displayInfo(){
System.out.println(id+" "+name);
System.out.println("answers are:");
Iterator<String> itr=answers.iterator();
while(itr.hasNext()){
System.out.println(itr);
}
}
}
My Test class as below.
public class Test {
public static void main(String[] args) {
Resource r=new ClassPathResource("applicationContext.xml");
BeanFactory factory=new XmlBeanFactory(r);
Question q=(Question)factory.getBean("q");
q.displayInfo();
}
}
This is my applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="q" class="DependencyInjection.Question">
<constructor-arg value="111"></constructor-arg>
<constructor-arg value="What is java?"></constructor-arg>
<constructor-arg>
<list>
<value>Java is a programming language</value>
<value>Java is a Platform</value>
<value>Java is an Island of Indonasia</value>
</list>
</constructor-arg>
</bean>
</beans>
Out put as below.
java.util.AbstractList$Itr@15aaf0b3 java.util.AbstractList$Itr@15aaf0b3 java.util.AbstractList$Itr@15aaf0b3 java.util.AbstractList$Itr@15aaf0b3 java.util.AbstractList$Itr@15aaf0b3 java.util.AbstractList$Itr@15aaf0b3 java.util.AbstractList$Itr@15aaf0b3 java.util.AbstractList$Itr@15aaf0b3 java.util.AbstractList$Itr@15aaf0b3 java.util.AbstractList$Itr@15aaf0b3 java.util.AbstractList$Itr@15aaf0b3 java.util.AbstractList$Itr@15aaf0b3 java.util.AbstractList$Itr@15aaf0b3
This is infinite loop. How can I solve this issue?
You are not advancing the Iterator
, so your loop never ends.
Change:
while(itr.hasNext()){
System.out.println(itr);
}
to:
while(itr.hasNext()){
System.out.println(itr.next());
}
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