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Explanation

SpEL can be used with @Value to calculate or dynamically resolve values during Spring bean creation.

Code:

@Value("#{10 + 20}")
private int total;

// total = 30

Explanation

SPEL can reference another Spring bean using the @beanName syntax.

Code:

@Value("#{@pricingService.getDiscount()}")
private double discount;

Explanation

SpEL can access properties from application configuration and combine them with expressions.

Code:

@Value("${app.max-users}")
private int maxUsers;

Explanation

Conditional expressions can be used inside @Value to select different values.

Code:

@Value("#{${app.enabled} ? 'ACTIVE' : 'INACTIVE'}")
private String status;

Explanation

SpEL can be used in bean configuration when a bean property needs to be calculated dynamically.

Code:

@Bean
public String applicationMode() {
    return "#{systemProperties['app.mode']}";
}