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Create HashMapTest.java

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	`1`	`+//Version 11.1`
	`2`	`+`
	`3`	`+import java.util.*;`
	`4`	`+`
	`5`	`+class Student`
	`6`	`+{`
	`7`	`+ int rollno , marks;`
	`8`	`+ Student(int r,int m)`
	`9`	`+ {`
	`10`	`+ rollno=r;`
	`11`	`+ marks=m;`
	`12`	`+ }`
	`13`	`+ public String toString()`
	`14`	`+ {`
	`15`	`+ return(rollno+" : "+marks);`
	`16`	`+ }`
	`17`	`+ public int hashCode()`
	`18`	`+ {`
	`19`	`+ return(rollno);`
	`20`	`+ }`
	`21`	`+ public boolean equals(Object ob)`
	`22`	`+ {`
	`23`	`+ Student st=(Student)ob;`
	`24`	`+ return(rollno == st.rollno);`
	`25`	`+ }`
	`26`	`+}`
	`27`	`+class HashMapTest`
	`28`	`+{`
	`29`	`+ public static void main(String s[])`
	`30`	`+ {`
	`31`	`+ HashMap hm=new HashMap();`
	`32`	`+ hm.put(new Student(101,80),"abc");`
	`33`	`+ hm.put(new Student(102,75),"xyz");`
	`34`	`+ hm.put(new Student(103,85),"pqr");`
	`35`	`+ hm.put(new Student(101,55),"hij");`
	`36`	`+`
	`37`	`+ Set st=hm.keySet();`
	`38`	`+ Iterator itr=st.iterator();`
	`39`	`+ while(itr.hasNext())`
	`40`	`+ {`
	`41`	`+ Student key=(Student)itr.next();`
	`42`	`+ String value=(String)hm.get(key);`
	`43`	`+ System.out.println(key+" : "+value);`
	`44`	`+ }`
	`45`	`+ }`
	`46`	`+}`

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