Java Program:
Write a program to find out duplicate characters in a string?
Description:
Write a program to find out duplicate or repeated characters in a
string, and calculate the count of repeatation.
Code:
package com.java2novice.algos;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
public class DuplicateCharsInString {
public void findDuplicateChars(String str){
Map<Character, Integer> dupMap = new HashMap<Character, Integer>();
char[] chrs = str.toCharArray();
for(Character ch:chrs){
if(dupMap.containsKey(ch)){
dupMap.put(ch, dupMap.get(ch)+1);
} else {
dupMap.put(ch, 1);
}
}
Set<Character> keys = dupMap.keySet();
for(Character ch:keys){
if(dupMap.get(ch) > 1){
System.out.println(ch+"--->"+dupMap.get(ch));
}
}
}
public static void main(String a[]){
DuplicateCharsInString dcs = new DuplicateCharsInString();
dcs.findDuplicateChars("Java2Novice");
}
}
Output:
v--->2
a--->2
Write a program to find out duplicate characters in a string?
Description:
Write a program to find out duplicate or repeated characters in a
string, and calculate the count of repeatation.
Code:
package com.java2novice.algos;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
public class DuplicateCharsInString {
public void findDuplicateChars(String str){
Map<Character, Integer> dupMap = new HashMap<Character, Integer>();
char[] chrs = str.toCharArray();
for(Character ch:chrs){
if(dupMap.containsKey(ch)){
dupMap.put(ch, dupMap.get(ch)+1);
} else {
dupMap.put(ch, 1);
}
}
Set<Character> keys = dupMap.keySet();
for(Character ch:keys){
if(dupMap.get(ch) > 1){
System.out.println(ch+"--->"+dupMap.get(ch));
}
}
}
public static void main(String a[]){
DuplicateCharsInString dcs = new DuplicateCharsInString();
dcs.findDuplicateChars("Java2Novice");
}
}
Output:
v--->2
a--->2
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