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String str = null;
String str_1 = "";
String str_2 = " ";
System.out.println("str==null?:"+(str == null));
System.out.println("str==\"\"?:"+(str == ""));
System.out.println("str==\" \"?"+(str == " "));
System.out.println("\n");
System.out.println("str_1==null?:"+(str_1 == null));
System.out.println("str_1==\"\"?:"+(str_1 == ""));
System.out.println("str_1==\" \"?:"+(str_1 == " "));
System.out.println("\n");
System.out.println("str_2==null?:"+(str_2 == null));
System.out.println("str_2==\"\"?:"+(str_2 == ""));
System.out.println("str_2==\" \"?:"+(str_2 == " "));