判断2个集合中是否有相同的元素

用Collections.disjoint(Collection<?> c1, Collection<?> c2)方法:有相同元素返回false,

List a = new ArrayList();
a.add("AHRG");
a.add("BHRC");
a.add("WHRA");
a.add("TEMA");
a.add("TEMD");

List b = new ArrayList();
b.add("AHRG");
boolean disjoint = Collections.disjoint(b, a);
System.out.println(disjoint);//false