overriding equals method in java -



overriding equals method in java -

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when need override equals , hashcode methods? [duplicate] 3 answers import java.util.*; public class vehicle implements comparable<vehicle>{ private string name; private int modelno; public vehicle(string name,int modelno ){ this.name=name; this.modelno=modelno; } public void setname(){ this.name=name; } public string getname(){ homecoming name; } public void setmodelno(){ this.modelno=modelno; } public int getmodelno(){ homecoming modelno; } public int compareto(vehicle v){ homecoming v.name.compareto(name); } public int hashcode(){ homecoming 1; } public boolean equals(object o){ } public string tostring(){ homecoming name+" "+modelno; }

i don't know how override equals ? benefit of , why necessary utilize treeset sort object in main class.

for sorting need implement compareto method.

how implement java comparable interface?

java equals hashcode overriding comparable

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