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2010-06-01T05:18:49Z

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в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== ObjectUtils.defaultIfNull ==



<source lang="java">
import org.apache.rumons.lang.ObjectUtils;
public class MainClass {
public static void main(String[] args) {
//Create ObjectUtilsTrial instance
MyClass one = new MyClass();
MyClass two = one; //Same Reference
MyClass three = new MyClass(); //New Object
MyClass four = null;
//four is null, returns DEFAULT
System.out.print("1) If null return DEFAULT >>>");
System.out.println(ObjectUtils.defaultIfNull(four, "DEFAULT"));
}
}
class MyClass{
public String toString() {
return "toString Output";
}
}</source>



<pre class=codeResult>1) If null return DEFAULT >>>DEFAULT</pre>

== ObjectUtils.equals ==



<source lang="java">
import org.apache.rumons.lang.ObjectUtils;
public class MainClass {
public static void main(String[] args) {
//Create ObjectUtilsTrial instance
MyClass one = new MyClass();
MyClass two = one; //Same Reference
MyClass three = new MyClass(); //New Object
MyClass four = null;

//one and two point to the same object
System.out.print("2) References to the same object >>>");
System.out.println(ObjectUtils.equals(one, two));
}
}
class MyClass{
public String toString() {
return "toString Output";
}
}</source>



<pre class=codeResult>2) References to the same object >>>true</pre>

== ObjectUtils.equals2 ==



<source lang="java">
import org.apache.rumons.lang.ObjectUtils;
public class MainClass {
public static void main(String[] args) {
//Create ObjectUtilsTrial instance
MyClass one = new MyClass();
MyClass two = one; //Same Reference
MyClass three = new MyClass(); //New Object
MyClass four = null;
//one and three are different objects
System.out.print("3) Check object references and not values >>>");
System.out.println(ObjectUtils.equals(one, three));
}
}
class MyClass{
public String toString() {
return "toString Output";
}
}</source>



<pre class=codeResult>3) Check object references and not values >>>false</pre>

== ObjectUtils.identityToString ==



<source lang="java">
import org.apache.rumons.lang.ObjectUtils;
public class MainClass {
public static void main(String[] args) {
//Create ObjectUtilsTrial instance
MyClass one = new MyClass();
MyClass two = one; //Same Reference
MyClass three = new MyClass(); //New Object
MyClass four = null;
//Object details displayed..toString is not called
System.out.print("5) Display object details >>>");
System.out.println(ObjectUtils.identityToString(one));
}
}
class MyClass{
public String toString() {
return "toString Output";
}
}</source>



<pre class=codeResult>5) Display object details >>>MyClass@b89838</pre>

== ObjectUtils.toString ==



<source lang="java">
import org.apache.rumons.lang.ObjectUtils;
public class MainClass {
public static void main(String[] args) {
//Create ObjectUtilsTrial instance
MyClass one = new MyClass();
MyClass two = one; //Same Reference
MyClass three = new MyClass(); //New Object
MyClass four = null;
//Pass null get empty string
System.out.print("6) Pass null and get back an Empty string >>>");
System.out.println("**" + ObjectUtils.toString(null) + "**");
}
}
class MyClass{
public String toString() {
return "toString Output";
}
}</source>



<pre class=codeResult>6) Pass null and get back an Empty string >>>****</pre>

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Java Tutorial/Apache Common/ObjectUtils - История изменений

Admin: 1 версия

в 17:44, 31 мая 2010