public class Animal $\{$

private String name;

private int birthYear;

private double weight;

private char gender;

$//$ Default constructor

Animal$()\{$

this.name $=""$;

this.birthYear $=1900$;

this.weight $=0$;

this.gender $=\text{'}$u$\text{'}$;

$\}$

$//$ Parameterized constructor

Animal$($String name, int year, double weight, char gender$)\{$

this.name $=$ name;

this.birthYear $=$ year;

this.weight $=$ weight;

this.gender $=$ gender;

$\}$

public String getName$()\{$

return name;

$\}$

public int getBirthYear$()\{$

return birthYear;

$\}$

public double getWeight$()\{$

return weight;

$\}$

public char getGender$()\{$

return gender;

$\}$

public void setName$($String name$)\{$

this.name $=$ name;

$\}$

public void setBirthYear$($int birthYear$)\{$

this.birthYear $=$ birthYear;

$\}$

public void setWeight$($double weight$)\{$

if $($weight $<0)$

this.weight $=-1$;

else

this.weight $=$ weight;

$\}$

public void setGender$($char gender$)\{$

if $($gender $!=\text{'}$m$\text{'}$ && gender $!=\text{'}$f$\text{'})$

this.gender $=\text{'}$u$\text{'}$;

else

this.gender $=$ gender;

$\}$

public int calculateAge$($int current$)\{$

if $($current $<$ this.birthYear$)$

return $-1$;

return current $-$ this.birthYear;

$\}$

public boolean isMale$()\{$

return this.gender $==\text{'}$m$\text{'}$;

$\}$

public boolean isFemale$()\{$

return this.gender $==\text{'}$f$\text{'}$;

$\}$

public void gainWeight$()\{$

this.weight$++$;

$\}$

public void gainWeight$($double x$)\{$

if $($x $>=0)$

this.weight $+=$ x;

$\}$

public void loseWeight$()\{$

this.weight $=$ Math.max$(0,$ this.weight $-1)$;

$\}$

public void loseWeight$($double x$)\{$

if $($x $>=0)\{$

this.weight $=$ Math.max$(0,$ this.weight $-$ x$)$;

$\}$

$\}$

public void printDetails$()\{$

String name $=$ String.format$("$Name: $\%20$s$",$ this.name$)$;

String year $=$ String.format$("$Year of Birth: $\%4$d$",$ this.birthYear$)$;

String w $=$ String.format$("$Weight: $\%10\mathrm{.}2$f$",$ this.weight$)$;

String g $=$ String.format$("$Gender: $\%$c$",$ this.gender$)$;

System.out.println$($name $+"|"+$ year $+"|"+$ w $+"|"+$ g$)$;

$\}$

$\}$