concourse.java

基本数据结构

package concourseApp;

public interface Concourse 
{
	public boolean reside(double item,MyConcourse sa);
	public MyConcourse Union(MyConcourse sa,MyConcourse sb);
	public MyConcourse intersection(MyConcourse sa,MyConcourse sb);
	public MyConcourse difference(MyConcourse sa,MyConcourse sb);
}