Student類定義學生姓名，學號，生日，性別，院系屬性，及其get()、set()方法。

public class Student
{
	private String name;
	private String number;
	private String borthday;
	private String sex;
	private String department;
	public String getName()
	{
		return name;
	}
	public void setName(String name)
	{
		this.name = name;
	}
	public String getNumber()
	{
		return number;
	}
	public void setNumber(String number)
	{
		this.number = number;
	}
	public String getBorthday()
	{
		return borthday;
	}
	public void setBorthday(String borthday)
	{
		this.borthday = borthday;
	}
	public String getSex()
	{
		return sex;
	}
	public void setSex(String sex)
	{
		this.sex = sex;
	}
	public String getDepartment()
	{
		return department;
	}
	public void setDepartment(String department)
	{
		this.department = department;
	}
	
}
 

Test類新建兩個學生物件在compareStudents()函式中呼叫compareTo()方法比較兩個學生物件的姓名的字典順序，並返回compareTo()方法的返回值。以返回值讓字典順序靠前的學生資訊優先輸出。

public class Test
{
	public static void main(String[] args)
	{
		Student s1=new Student();
		Student s2=new Student();
		
		s1.setName("王強");
		s1.setNumber("100");
		s1.setSex("男");
		s1.setBorthday("1997.1.1");
		s1.setDepartment("藝術與表演");
		
		s2.setName("李天");
		s2.setNumber("103");
		s2.setSex("女");
		s2.setBorthday("1996.8.7");
		s2.setDepartment("資訊");
		
		int a=compareStudents(s1,s2);
		if(a>0)
		{
			System.out.print(s2.getName());
			System.out.print(" "+s2.getNumber());
			System.out.print(" "+s2.getSex());
			System.out.print(" "+s2.getBorthday());
			System.out.println(" "+s2.getDepartment());
		}
		
		System.out.print(s1.getName());
		System.out.print(" "+s1.getNumber());
		System.out.print(" "+s1.getSex());
		System.out.print(" "+s1.getBorthday());
		System.out.println(" "+s1.getDepartment());
		
		if(a<=0)
		{
			System.out.print(s2.getName());
			System.out.print(" "+s2.getNumber());
			System.out.print(" "+s2.getSex());
			System.out.print(" "+s2.getBorthday());
			System.out.println(" "+s2.getDepartment());
		}
		
	}
	
	public static int compareStudents(Student s1,Student s2)
	{
		String sname1=s1.getName();
		String sname2=s2.getName();
		return sname1.compareTo(sname2);
	}
}
 

李天 103 女 1996.8.7 資訊
王強 100 男 1997.1.1 藝術與表演