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Spring Beans
Last Updated : 26 May, 2026
title: Spring Beans
Spring Framework35 words7 headingsExamples included
title: Spring Beans description: Spring beans ka concept aur scope
Spring IoC container manage karne wale objects = Beans.
Bean Scopes
Singleton (Default)
java exampleWoHoTech
@Component
@Scope("singleton") // Default
public class DatabaseConfig {
// Ek hi instance — poori application mein share
}Prototype
java exampleWoHoTech
@Component
@Scope("prototype")
public class ShoppingCart {
// Har getBean() call pe naya instance
}Request (Web)
java exampleWoHoTech
@Component
@Scope(value = WebApplicationContext.SCOPE_REQUEST, proxyMode = ScopedProxyMode.TARGET_CLASS)
public class RequestContext {
// Har HTTP request mein naya instance
}Session (Web)
java exampleWoHoTech
@Component
@Scope(value = WebApplicationContext.SCOPE_SESSION, proxyMode = ScopedProxyMode.TARGET_CLASS)
public class UserPreferences {
// Har HTTP session mein naya instance
}Bean Lifecycle
java exampleWoHoTech
@Component
public class MyBean implements InitializingBean, DisposableBean {
@PostConstruct
public void init() {
System.out.println("Bean initialized");
}
@PreDestroy
public void cleanup() {
System.out.println("Bean destroyed");
}
@Override
public void afterPropertiesSet() { /* InitializingBean */ }
@Override
public void destroy() { /* DisposableBean */ }
}@Configuration + @Bean
java exampleWoHoTech
@Configuration
public class AppConfig {
@Bean
public DataSource dataSource() {
HikariDataSource ds = new HikariDataSource();
ds.setJdbcUrl("jdbc:mysql://localhost/mydb");
ds.setUsername("root");
ds.setPassword("pass");
return ds;
}
@Bean
public JdbcTemplate jdbcTemplate(DataSource dataSource) {
return new JdbcTemplate(dataSource);
}
}Exam Focus
Revise definitions, diagrams, examples, and short-answer points for Spring Beans.
Interview Use
Prepare one clear explanation, one practical example, and one common mistake for this Java topic.
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