public class M1{}

public class M2 extends M1 {}

public class Test {

	public doSomething(Boolean big){
		M2 ret;
		
		ret1;
		ret2;
		
		ret1=new M2();		
		ret2=new M2();		
		
		if(big){
			ret=ret1;
		}else{
			ret=ret2;
		}
		return(ret);
	}
}