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ReverseStringsInAList.java
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65 lines (49 loc) · 1.44 KB
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import java.util.ArrayList;
/**
* Reverse individual strings in a list
* Then reverse the list itself.
* @author Kavita
*
*/
public class ReverseStringsInAList {
public static void main(String[] args) {
ReverseStringsInAList app=new ReverseStringsInAList();
app.start();
}
public void start(){
ArrayList<String> strings=new ArrayList<String>();
ArrayList<String> stringsRev=new ArrayList<String>();
strings.add("Kavita");
strings.add("ate");
strings.add("orange");
strings.add("and");
strings.add("apple");
strings.add("sauce");
strings.add("!");
int j=0;
for(String s:strings){
char[] arr=s.toCharArray();
char[] arrTmp=new char[s.length()];
//write in reverse order into temporary storage
for(int k=arr.length-1; k>=0; k-- ){
arrTmp[arr.length-1-k]=arr[k];
}
String newStr=String.valueOf(arrTmp);
stringsRev.add(newStr);
j++;
}
System.out.println("Actual strings:");
System.out.println(strings);
System.out.println("\nReversed strings:");
//reverse the list itself by swapping first with last, etc
//in practice, you could use Collections.reverse(..)
for(int i=0; i<stringsRev.size()/2; i++){
String strFirst=stringsRev.get(i);
String strLast=stringsRev.get(stringsRev.size()-i-1);
stringsRev.set(i,strLast);
stringsRev.set(stringsRev.size()-i-1,strFirst);
}
//Collections.reverse(stringsRev);
System.out.println(stringsRev);
}
}