String object comparision, Java

String object comparision

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Compilation time: 0.83 sec, absolute running time: 0.15 sec, cpu time: 0.13 sec, memory peak: 18 Mb, absolute service time: 1,03 sec

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Error(s), warning(s):

source_file.java:22: warning: [rawtypes] found raw type: Map
        Map obj = new HashMap();
        ^
  missing type arguments for generic class Map<K,V>
  where K,V are type-variables:
    K extends Object declared in interface Map
    V extends Object declared in interface Map
source_file.java:22: warning: [rawtypes] found raw type: HashMap
        Map obj = new HashMap();
                      ^
  missing type arguments for generic class HashMap<K,V>
  where K,V are type-variables:
    K extends Object declared in class HashMap
    V extends Object declared in class HashMap
source_file.java:23: warning: [unchecked] unchecked call to put(K,V) as a member of the raw type Map
        obj.put("abc", 1);
               ^
  where K,V are type-variables:
    K extends Object declared in interface Map
    V extends Object declared in interface Map
source_file.java:24: warning: [unchecked] unchecked call to put(K,V) as a member of the raw type Map
        obj.put( 1, "abc");
               ^
  where K,V are type-variables:
    K extends Object declared in interface Map
    V extends Object declared in interface Map
4 warnings

str, str2, st3abcabcabc
(str==str2)true
str.equals(str2)true
(str==str3)false
str.equals(str3)true
str.intern() == str3.intern() = true
str.intern() == str2.intern() = true
{1=abc, abc=1}
true
false