Java Tutorial/Apache Common/CharSetUtils

Build Equals With EqualBuilder

   <source lang="java">

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();
 }

}</source>

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

   <source lang="java">

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" }));
 }

}</source>

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

CharSetUtils.delete

   <source lang="java">

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" }));
 }

}</source>

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

CharSetUtils.keep

   <source lang="java">

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"));
 }

}</source>

Keep B and o = BoB

CharSetUtils.squeeze

   <source lang="java">

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"));
 }

}</source>

Squeeze B and o = Borisbbbecker