public class Calculation {
private int number;
public int getNumber() {
    return number;
}
public void setNumber(int number) {
    this.number = number;
}
public int cube(){
    return number*number*number;
}
}

import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;

public class Test {
public static void main(String[] args) {
Calculation calculation=new Calculation();
StandardEvaluationContext context=new StandardEvaluationContext(calculation);
    
ExpressionParser parser = new SpelExpressionParser();
parser.parseExpression("number").setValue(context,"5");
    
System.out.println(calculation.cube());
}
}