Difference between Tuple and Collections in Scala :
1. Tuple store heterogenous data, means it can store different data types at a time. Where as collection stores same data type.
2. If we want to return two values from a function, lets say, we would like to return 1 and "Scala" at a time from a function we can use Tuple.
3. At max tuple can store 22 elements, But Collection can store more than 22 elements ( No restriction).
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String s = “abc” |
String s = new String(“abc”) |
Why? |
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Creation of string literals are the preferred way in java |
At times, we
may wish to create separate instance for each separate string in memory. We
can create one string object per string value using new keyword. |
If we create many strings with same char sequence assume String s = “abc” String s1 =”abc” String s2 = “abc” All these variables will have same reference, we will not create
the string again with same value in memory , this will save lot of memory in runtime.
If we create String s = new String(“abc”) String s1 = new String(“abc”) String s2 = new String(“abc”), then we will create different
objects/instances in heap memory. |
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The strings that are created with string literals are stored in
special memory in heap memory called string pool. String literals are stored in
String pool, a special memory area created by JVM |
The strings created with new operator will be stored in heap
memory but not in string pool |
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String s1 =”abc”, If we try to create same object , will have the reference of first
string stored in string pool Which is existing in pool already. |
String s1= new string (“abc”) String s2 = new String (“abc”) Different objects with different references will be created in
heap momory. |
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String literals are stored in string pool |
String objects are stored in head memory. |
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A string constant pool is a separate place in the heap memory where
the values of all the strings which are defined in the program are stored. |
When we declare a string, an object of type String is created in the
stack, while an instance with the value of the string is created in the heap |
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String str1 = "Hello";
String str1 = "Hello";String str2 = "Hello";
String str1 = "Hello";String str2 = "Hello";String str3 = "Class";
String str1 = new String("John");String str2 = new String("Doe");
Regards,
Swathi.