Use java programming for the following questions to have the
solutions ready within today Jan 3 2020 at or before 8:00PM GMT+8
time zone:
Question 10
String str = id + " "; // two spaces System.out.println(str.indexOf("5") + " + " + str.substring(0,2) + "\n"
+ str.trim().substring(5)+ "#");
List<String> aList = new Vector<>();
aList.add("one");
aList.add("two");
aList.add("three");
aList.add(2, "one");
aList.remove("one");
System.out.println(aList + "\n" + aList.size());
Answer
a) Output
It will output " index of the letter five + first two letters of the id " and on newline it prints "substring from 5 th position with a # symbol at the end"
working of each function
str.indexOf("5") - this will return the index of the first occurence of letter 5 in the id . If letter 5 is not present in id , then it will return -1
str.substring(0,2) - this will return the first two letters of the id, that is the letter at position 0 and 1
str.trim().substring(5) - trim function is used to remove the trailing and leading spaces in strings. so this will output a substring from the 5 th index of the string id which doesnt contains any leading spaces.
consider an example
if the variable id="675439";
after executing this code
String str = id + " "; // two
spaces
System.out.println(str.indexOf("5")
+ " + " + str.substring(0,2) + "\n"+ str.trim().substring(5)+
"#");
the output will be
2 + 67
9#
Here 2 is the index of letter 5 , 67 is the first two letters and 9 is the substring from 5 th index
b) Output
[two , one, three]
3
Reason :
aList.add("one"); -- add the string "one" to the list
after executing the below code
aList.add("one");
aList.add("two");aList.add("three");
the current list will be [one , two, three]
aList.add(2, "one"); - this statement will add the string "one " to index 2 => 3 rd position
then the list will be [one , two, one, three]
aList.remove("one"); - this will remove the element "one" from the string , here first occurence of one will be removed.
after that the list will be
[two , one, three]
and its size is 3
if you find this answer useful ,please rate positive , thankyou
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