BE THE CODER > Tools and Libs > Commons Lang3 Examples > General

Apache Commons Lang 3.0 is a java library with lot of utilities and reusable components. This requires the library commons-lang3-3.0.1.jar to be in classpath. The following example shows using StrSubstitutor.setEnableSubstitutionInVariables() API which enables nested variable substitutions. It allows us to evaluate variable names recursively.

File Name :	com/bethecoder/tutorials/commons_lang/tests/gen/NestedSubstitutionTest.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.commons_lang.tests.gen;



import java.util.HashMap;

import java.util.Map;



import org.apache.commons.lang3.text.StrSubstitutor;



public class NestedSubstitutionTest {



  /**

   * @param args

   */

  public static void main(String[] args) {

      

    Map<String, Object> valueMap = new HashMap<String, Object>();

    valueMap.put("ver_number", "2");

    valueMap.put("version", "GRD");

    valueMap.put("GRD2", "Garuda Version Two");

    

    String template = "Product version : ${${version}${ver_number}}";

    StrSubstitutor sub = new StrSubstitutor(valueMap);

    sub.setEnableSubstitutionInVariables(true);

    System.out.println(sub.replace(template));

  }



}

Nested Substitutions