import java.util.*;
public class Relation {public Vector<Vector> v=new Vector<Vector>();
public static Vector<String> elem1=new Vector<String>();
public static Vector<String> elem2=new Vector<String>();
public static Vector<String> elem3=new Vector<String>();
public static void main(String args[]){
Relation A=new Relation();
A.elem1.addElement("1");
A.elem1.addElement("a1");
//A.elem1.addElement("d");
//A.elem1.addElement("c");
A.elem2.addElement("2");
A.elem2.addElement("a3");
A.elem3.addElement("3");
A.elem3.addElement("d");
A.v.addElement(elem1);
A.v.addElement(elem2);
A.v.addElement(elem3);
System.out.println(A.v);
Relation B=new Relation();
B.elem1.addElement("1");
B.elem1.addElement("a1");
B.elem2.addElement("2");
B.elem2.addElement("a3");
B.elem3.addElement("3");
B.elem3.addElement("e");
B.v.addElement(elem1);
B.v.addElement(elem3);
B.v.addElement(elem3);
System.out.println(B.v);
}}运行结果如下[[1, a1], [2, a3], [3, d]]
[[1, a1, 1, a1], [3, d, 3, e], [3, d, 3, e]]
public class Relation {public Vector<Vector> v=new Vector<Vector>();
public static Vector<String> elem1=new Vector<String>();
public static Vector<String> elem2=new Vector<String>();
public static Vector<String> elem3=new Vector<String>();
public static void main(String args[]){
Relation A=new Relation();
A.elem1.addElement("1");
A.elem1.addElement("a1");
//A.elem1.addElement("d");
//A.elem1.addElement("c");
A.elem2.addElement("2");
A.elem2.addElement("a3");
A.elem3.addElement("3");
A.elem3.addElement("d");
A.v.addElement(elem1);
A.v.addElement(elem2);
A.v.addElement(elem3);
System.out.println(A.v);
Relation B=new Relation();
B.elem1.addElement("1");
B.elem1.addElement("a1");
B.elem2.addElement("2");
B.elem2.addElement("a3");
B.elem3.addElement("3");
B.elem3.addElement("e");
B.v.addElement(elem1);
B.v.addElement(elem3);
B.v.addElement(elem3);
System.out.println(B.v);
}}运行结果如下[[1, a1], [2, a3], [3, d]]
[[1, a1, 1, a1], [3, d, 3, e], [3, d, 3, e]]
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public class Relation { public Vector<Vector> v=new Vector<Vector>();
public static Vector<String> elem1=new Vector<String>();
public static Vector<String> elem2=new Vector<String>();
public static Vector<String> elem3=new Vector<String>();
public static void main(String args[]){
Relation A=new Relation();
A.elem1.addElement("1");
A.elem1.addElement("a1");
//A.elem1.addElement("d");
//A.elem1.addElement("c");
A.elem2.addElement("2");
A.elem2.addElement("a3");
A.elem3.addElement("3");
A.elem3.addElement("d");
A.v.addElement(elem1);
A.v.addElement(elem2);
A.v.addElement(elem3);
elem1.removeAllElements();
elem2.removeAllElements();
elem3.removeAllElements();
System.out.println(A.v);
Relation B=new Relation();
B.elem1.addElement("1");
B.elem1.addElement("a1");
B.elem2.addElement("2");
B.elem2.addElement("a3");
B.elem3.addElement("3");
B.elem3.addElement("e");
B.v.addElement(elem1);
B.v.addElement(elem2);
B.v.addElement(elem3);
System.out.println(B.v);
}}