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mLine 3:
Line 3: − sudo apt-get update+ − sudo apt-get install oracle-java8-installer</nowiki>+ Line 319:
Line 319: − + + + + + + + + + + + + + + + + + + + + +
→Collections
===With apt===
===With apt===
<nowiki>sudo apt-add-repository ppa:webupd8team/java
<nowiki>sudo apt-add-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer</nowiki>
Also ensure your JAVA_HOME variable has been set to:
Also ensure your JAVA_HOME variable has been set to:
</syntaxhighlight>
</syntaxhighlight>Collections.sort(<array_list_var>)
Requires implementation of Comparable interface. ej:<syntaxhighlight lang="java">
public class Student implements Comparable<Student> {
private int id;
private String name;
public Student(int id, String name){
super();
this.id = id;
this.name = name;
}
public int getId() {
return id;
}
@override
public int compareTo(Student that){
return Integer.compare(this.id, that.id);
}
}
</syntaxhighlight><br />
==Classes and Objects==
==Classes and Objects==
<source lang="java">
<source lang="java">