java中要比较两个集合,只能自己用contailall了,代码如下:
public class SetUtils {
public static boolean equals(Set<?> set1, Set<?> set2){
if(set1 == null || set2 ==null){
return false;
}
if(set1.size()!=set2.size()){
return false;
}
return set1.containsAll(set2);
}
Set<String> test1 = new HashSet<>();
test1.add("a");
test1.add("b");
Set<String> test2 = new HashSet<>();
test2.add("b");
test2.add("a");
assertThat(SetUtils.equals(test1, test2), is(true));
Set<String> test1 = new HashSet<>();
test1.add("a");
test1.add("b");
test1.add("c");
Set<String> test2 = new HashSet<>();
test2.add("a");
test2.add("b");
assertThat(SetUtils.equals(test1, test2), is(false));