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public?class?Testcase?{

int?x1[],?x2[];

Testcase(int?a[],?int?b[])?{

x1?=?a;

x2?=?b;

}

Testcase(Testcase?d)?{

x1?=?d.x1;

x2?=?d.x2;

}

public?void?Jiaoji(Testcase?a)?{

for?(int?i?=?0;?i?

for?(int?j?=?0;?j?

if?(a.x1[i]?==?a.x2[j])?{

System.out.print(a.x1[i]?+?",");

}

}

}

System.out.println("");

}

public?static?void?main(String[]?args)?{

int?x1[]?=?{

1,?4,?6,?9,?12,?18,?19,?45

};

int?x2[]?=?{

4,?7,?9,?13,?19,?23,?29,?67

};

Testcase?b?=?new?Testcase(x1,?x2);

System.out.println("交集是;");

b.Jiaoji(b);

System.out.println("并集32313133353236313431303231363533e78988e69d8331333335313733是;");

int?union[]?=?union(b);

for?(int?i?:?union)?{

System.out.print(i?+?"?");

}

System.out.print("\n差集是:?");

System.out.print("\n");

int?diff[]?=?difference(b);

for?(int?i?:?diff)?{

System.out.print(i?+?"?");

}

}

//并集

static?public?int[]?union(Testcase?a)?{

HashSet?set?=?new?HashSet();

for?(int?i?:?a.x1)?{

set.add(new?Integer(i));

}

for?(int?i?:?a.x2)?{

set.add(new?Integer(i));

}

int?size?=?set.size();

int?out[]?=?new?int[size];

Iterator?iter?=?set.iterator();

for?(int?i?=?0;?i?

//

//while(i.hasNext()){

out[i]?=?((Integer)?iter.next()).intValue();

}

return?out;

}

//差集

static?public?int[]?difference(Testcase?a)?{

HashSet?set?=?new?HashSet();

for?(int?i?:?a.x1)?{

set.add(new?Integer(i));

}

for?(int?i?:?a.x2)?{

set.remove(new?Integer(i));

}

int?size?=?set.size();

int?out[]?=?new?int[size];

Iterator?iter?=?set.iterator();

for?(int?i?=?0;?i?

out[i]?=?((Integer)?iter.next()).intValue();

}

return?out;

}

}

總結

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