find next odd,even,prime and Composite numbers

import java.util.*;
public class mynumber{
int num,odd,even,comp,prime;
public mynumber(){
num=0;
odd=1;
even=1;
comp=4;
prime=3;
}

public int next_number(){
num=num+1;
return num;
}

public boolean isodd(int n){
if(n%2==1)
return true;
else return false;
}

public int next_odd(){
odd=odd+1;
while(!isodd(odd)){
odd=odd+1;
}
return odd;
}

public int next_even(){
even=even+1;
while(isodd(even)){
even=even+1;
}
return even;
}
public int next_comp(){
comp=comp+1;

for(int i=2;i<comp;i++){
if(comp%i==0) break;
else comp=comp+1;
}
return comp;
}
public int next_prime(){
prime=prime+1;
int x=0;
for(int i=2;i<prime;i++){
if(prime%i==0)  prime=prime+1;
else break;
}
return prime;
}

public static void main(String[] a){
mynumber n=new mynumber();

System.out.println("next odd number= "+n.next_odd());
System.out.println("next even number= "+n.next_even());
System.out.println("next Composite number= "+n.next_comp());
System.out.println("next prime number= "+n.next_prime());
}
}
/*C:\Users\KAPILAN\Desktop>javac mynumber.java

C:\Users\KAPILAN\Desktop>java mynumber
next odd number= 3
next even number= 2
next Composite number= 6
next prime number= 5*/