Java Tutorial/Apache Common/CharSetUtils

Build Equals With EqualBuilder

import org.apache.rumons.lang.builder.EqualsBuilder;
import org.apache.rumons.lang.builder.HashCodeBuilder;
import org.apache.rumons.lang.builder.ToStringBuilder;
import org.apache.rumons.lang.builder.ToStringStyle;

public class MainClass {
  public static void main(String[] args) {
    //Create new BuilderTrial instances
    BuilderTrial one = new BuilderTrial("Becker", 35);
    BuilderTrial two = new BuilderTrial("Becker", 35);
    BuilderTrial three = new BuilderTrial("Agassi", 33);
    //one and two hold the same data in different objects
    //three holds different data
    System.out.println("One>>>" + one);
    System.out.println("Two>>>" + two);
    System.out.println("Three>>>" + three);
    System.out.println("one equals two? " + one.equals(two));
    System.out.println("one equals three? " + one.equals(three));
    //As one and two hold the same data, the same hashcode is returned.
    System.out.println("One HashCode>>> " + one.hashCode());
    System.out.println("Two HashCode>>> " + two.hashCode());
    System.out.println("Three HashCode>>> " + three.hashCode());
  }
}
class BuilderTrial {
  private String name;
  private int age;
  public BuilderTrial(String name, int age) {
      this.name = name;
      this.age = age;
  }
  public static void main(String[] args) {
  }
  public boolean equals(Object objCompared) {
      if (!(objCompared instanceof BuilderTrial)) {
          return false;
      }
      BuilderTrial rhs = (BuilderTrial) objCompared;
      return new EqualsBuilder().append(name, rhs.name).append(age, rhs.age)
                                .isEquals();
  }
  public String toString() {
      return new ToStringBuilder(this, ToStringStyle.MULTI_LINE_STYLE).append("Name",
          name).append("Age", age).toString();
  }
  public int hashCode() {
      return new HashCodeBuilder(15, 19).append(name).append(age).toHashCode();
  }
}

One>>>BuilderTrial@a981ca[
  Name=Becker
  Age=35
]
Two>>>BuilderTrial@e7b241[
  Name=Becker
  Age=35
]
Three>>>BuilderTrial@167d940[
  Name=Agassi
  Age=33
]
one equals two? true
one equals three? false
One HashCode>>> -923455822
Two HashCode>>> -923455822
Three HashCode>>> -1433293806

CharSetUtils.count

import org.apache.rumons.lang.CharSetUtils;
public class MainClass {
  public static void main(String[] args) {
    //Count all occurrences of all the characters specified.
    System.out.println("B and o count = " +
        CharSetUtils.count("BorisBecker", "Bo"));
    System.out.println("B,o,k,e and r count = " +
        CharSetUtils.count("BorisBecker", new String[] { "Bo", "ker" }));
  }
}

B and o count = 3
B,o,k,e and r count = 8

CharSetUtils.delete

import org.apache.rumons.lang.CharSetUtils;
public class MainClass {
  public static void main(String[] args) {
    //Specified characters deleted.                
    System.out.println("Delete B and o = " +
        CharSetUtils.delete("BorisBecker", "Bo"));
    System.out.println("Delete B,o,k,e and r = " +
        CharSetUtils.delete("BorisBecker", new String[] { "Bo", "ker" }));
  }
}

Delete B and o = risecker
Delete B,o,k,e and r = isc

CharSetUtils.keep

import org.apache.rumons.lang.CharSetUtils;
public class MainClass {
  public static void main(String[] args) {
    //Keeps only the characters specified
    System.out.println("Keep B and o = " +
        CharSetUtils.keep("BorisBecker", "Bo"));
  }
}

Keep B and o = BoB

CharSetUtils.squeeze

import org.apache.rumons.lang.CharSetUtils;
public class MainClass {
  public static void main(String[] args) {
    //Removes specified character repetitions  
    System.out.println("Squeeze B and o = " +
        CharSetUtils.squeeze("BBoooorisbbbecker", "Bo"));
  }
}

Squeeze B and o = Borisbbbecker