To compare two strings in java I used following code
String ary[]={"man","john","su"};
String ary1[]={"john","man","su"};
if(Arrays.equals(ary,ary1)) {
System.out.println("equal");
} else {
System.out.println("not equal");
}
It prints "not equal",But this two arrays are having same values.
Indeed here the both arrays are same but values positions change.
How can I tell that this kind of arrays are same.
Try this it will work.
String ary[]={"man","john","su"};
String ary1[]={"john","man","su"};
boolean isEqual = true;
if(ary.length != ary1.length) {
System.out.println("not equal");
} else {
int countEquals = 0;
ArrayList<String> wordList = new ArrayList(Arrays.asList(ary1) );
for (String str : ary) {
if (wordList.contains(str)) {
countEquals++;
wordList.remove(str);
} else {
isEqual = false;
System.out.println("not equal");
break;
}
}
if (isEqual) {
System.out.println("equal");
}
}
From what I see you just try to see if they are equal, if this is true, just go with something like this:
boolean areEqual = Arrays.equals(Arrays.sort(arr1), Arrays.sort(arr2));
This is the standard way of doing it.
Doing so because like ZouZou states and as marked in the documentation:
"Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order"
Use Sets:
if (ary.length == ary1.length && new HashSet<>(Arrays.asList(ary)).equals(new HashSet<>(Arrays.asList(ary1)))
Test code:
String ary[] = { "man", "john", "su" };
String ary1[] = { "john", "man", "su" };
Set<String> set1 = new HashSet<>(Arrays.asList(ary));
Set<String> set2 = new HashSet<>(Arrays.asList(ary1));
System.out.println(ary.length == ary1.length && set1.equals(set2));
Output:
true
ary is { "man", "john", "man", "su" };, then ary is not equals to ary1.
String ary[] = { "man", "john", "su" ,"man"}; String ary1[] = { "john", "man", "su" ,"john"};. Still outputs true.String ary[] = { "man", "john", "su" };
String ary1[] = { "man", "john", "su" };
boolean check = true;
for(int i=0; i<ary.length; i++)
{
for(int j=0; j<ary1.length; j++)
{
if(i == j)
{
if(!ary[i].equals(ary1[j]))
{
check = false;
}
}
}
}
This code may be help you. Good Luck.
