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How to implement Hash Map?
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Answer / rice
HashMap is a class that implements Map interface.
HashMap underlined data structure is Hash table.
If we want to describe the group of objects as key ,value
pairs then we go for HashMap class.
key are not duplicated but value can be any thing.
null insertion is possible.
insertion order is not preserved.
HashMap hm=new HashMap();
hm.put(1, "rice");
hm.put(3, "rice");
hm.put(2, "shine");
System.out.println(hm);
| Is This Answer Correct ? | 2 Yes | 1 No |
Answer / brijendra-java (xavient)
HashMap is the implementaion of Map interface.
HashMap is key value pair storage concept.
HasMap does not allow duplicate key but value may be any
thing.
HasMap allow both key and Valuea as NULL.
HasMap is the Unordered collection.
When we change the iteration of HasMap then it give
concurrent Modification error.
HasMap is NonSyncronised class.
HashMap hMap = new HashMap();
hMap.put(Null, Null);
hMap.put(1, a);
hMap.put(2, b);
hMap.put(3, c);
system.out.println("Size"+hMap.size());
| Is This Answer Correct ? | 0 Yes | 0 No |
Write a program for the problem: the array of inetegers indicating the marks of the students is given, U have to calculate the percentile of the students aaccording to this rule: the percentile of a student is the %of no of student having marks less then him. For eg: suppose Student Marks A 12 B 60 C 80 D 71 E 30 F 45 percentile of C = 5/5 *100 = 100 (out of 5 students 5 are having marks less then him) percentile of B = 3/5*100 = 60% (out of 5, 3 have markses less then him) percentile of A = 0/5*100 = 0%.
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