Show me the steps to solve

public class Class$1\{$

public void m$1()\{$

System.out.print$("$one$")$;

$\}$

public void m$2()\{$

System.out.print$("$two$")$;

this.m$1()$;

$\}$

$\}$

public class Class$2$ extends Class$1\{$

public void m$1()\{$

System.out.print$("$three$")$;

super.m$2()$;

$\}$

public void m$2()\{$

System.out.print$("$four$")$;

$\}$

$\}$

Class$2$ number $=$ new Class$2()$;

number.m$1()$;