- Spring SpEL Tutorial
- Spring SpEL - Home
- Spring SpEL - Overview
- Spring SpEL - Environment Setup
- Spring SpEL - Create Project
- Expression Evaluation
- Spring SpEL - Expression Interface
- Spring SpEL - EvaluationContext
- Bean Configuration
- Spring SpEL - XML Configuration
- Spring SpEL - Annotation Configuration
- Language Reference
- Spring SpEL - Literal Expression
- Spring SpEL - Properties
- Spring SpEL - Array
- Spring SpEL - List
- Spring SpEL - Map
- Spring SpEL - Methods
- Operators
- Spring SpEL - Relational Operators
- Spring SpEL - Logical Operators
- Spring SpEL - Mathematical Operators
- Spring SpEL - Assignment Operator
- Special Operators
- Spring SpEL - Ternary Operator
- Spring SpEL - Elvis Operator
- Spring SpEL - Safe Navigation Operator
- Collections
- Spring SpEL - Collection Selection
- Spring SpEL - Collection Projection
- Other Features
- Spring SpEL - Constructor
- Spring SpEL - Variables
- Spring SpEL - Functions
- Spring SpEL - Expression Templating
- Spring SpEL - Useful Resources
- Spring SpEL - Quick Guide
- Spring SpEL - Useful Resources
- Spring SpEL - Discussion
Spring SpEL - Elvis Operator
SpEL expression supports Elvis operator which is a short form of ternary operator.
// Using ternary operator String result = name != null ? name: "unknown"; // Using Elvis Operator result = name?:"unknown";
Following example shows the various use cases.
Example
Let's update the project created in Spring SpEL - Create Project chapter. We're adding/updating following files −
Employee.java − Employee class.
MainApp.java − Main application to run and test.
Here is the content of Employee.java file −
package com.tutorialspoint; public class Employee { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } }
Here is the content of MainApp.java file −
package com.tutorialspoint; import java.text.ParseException; import org.springframework.expression.EvaluationContext; import org.springframework.expression.ExpressionParser; import org.springframework.expression.spel.standard.SpelExpressionParser; import org.springframework.expression.spel.support.StandardEvaluationContext; public class MainApp { public static void main(String[] args) throws ParseException { ExpressionParser parser = new SpelExpressionParser(); Employee employee = new Employee(); EvaluationContext employeeContext = new StandardEvaluationContext(employee); // Evaluates to "unknown" String result = parser.parseExpression("name?:'unknown'").getValue(employeeContext, String.class); System.out.println(result); employee.setName("Mahesh"); // Evaluates to "Mahesh" result = parser.parseExpression("name?:'unknown'").getValue(employeeContext, String.class); System.out.println(result); } }
Output
unknown Mahesh
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