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String t1 = "123123";
Map<String,String> hashMap = new HashMap<String,String>();
hashMap.put(t1,"000");
System.out.println(t1.hashCode());
System.out.println(hashMap.get(t1)); // 000
t1 = "1ahdjhajd";
System.out.println(t1.hashCode());
System.out.println(hashMap.get(t1)); // null