Check for an empty string

    
 
import org.apache.commons.lang.StringUtils;

public class Main {
  public static void main(String[] args) {
    String var1 = null;
    String var2 = "";
    String var3 = "    \t\t\t";
    String var4 = "Hello World";

    System.out.println("var1 is blank? = " + StringUtils.isBlank(var1));
    System.out.println("var2 is blank? = " + StringUtils.isBlank(var2));
    System.out.println("var3 is blank? = " + StringUtils.isBlank(var3));
    System.out.println("var4 is blank? = " + StringUtils.isBlank(var4));

    System.out.println("var1 is not blank? = " + StringUtils.isNotBlank(var1));
    System.out.println("var2 is not blank? = " + StringUtils.isNotBlank(var2));
    System.out.println("var3 is not blank? = " + StringUtils.isNotBlank(var3));
    System.out.println("var4 is not blank? = " + StringUtils.isNotBlank(var4));

    System.out.println("var1 is empty? = " + StringUtils.isEmpty(var1));
    System.out.println("var2 is empty? = " + StringUtils.isEmpty(var2));
    System.out.println("var3 is empty? = " + StringUtils.isEmpty(var3));
    System.out.println("var4 is empty? = " + StringUtils.isEmpty(var4));

    System.out.println("var1 is not empty? = " + StringUtils.isNotEmpty(var1));
    System.out.println("var2 is not empty? = " + StringUtils.isNotEmpty(var2));
    System.out.println("var3 is not empty? = " + StringUtils.isNotEmpty(var3));
    System.out.println("var4 is not empty? = " + StringUtils.isNotEmpty(var4));
  }
}

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Check for an empty string : String « Data Type « Java

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