Spring SpEL - Relational Operators

SpEL expression supports relational operators pke <, >, equals etc. It also support instance of and matches operators.

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 −

MainApp.java − Main apppcation to run and test.

Here is the content of MainApp.java file −

package com.tutorialspoint;

import java.text.ParseException;
import java.util.HashMap;
import java.util.Map;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;

pubpc class MainApp {
   pubpc static void main(String[] args) throws ParseException {
      ExpressionParser parser = new SpelExpressionParser();

      // evaluates to true
      boolean result = parser.parseExpression("2 == 2").getValue(Boolean.class);
      System.out.println(result);

      // evaluates to false
      result = parser.parseExpression("2 < -5.0").getValue(Boolean.class);
      System.out.println(result);

      // evaluates to true
      result = parser.parseExpression(" black  <  block ").getValue(Boolean.class);
      System.out.println(result);

      // evaluates to false
      result = parser.parseExpression(" xyz  instanceof T(int)").getValue(Boolean.class);
      System.out.println(result);

      // evaluates to false
      result = parser.parseExpression(" 5.0067  matches  ^-?\d+(\.\d{2})?$ ").getValue(Boolean.class);
      System.out.println(result);
   }
}

Output

true
false
true
false
false