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Lecture9Object - Object The Cosmic Superclass Most useful...

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Object: The Cosmic Superclass
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Most useful methods String toString ( ) boolean equals (Object otherObject) Object clone( )
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toString ( ) Override the toString ( ) method to describe the object’s state e.g. For BankAccount: public String toString ( ) { return “BankAccount[balance = “ + balance + “]”; }
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Interesting Fact toString( ) is invoked whenever you concatenate an object with a String BankAccount michael = new BankAccount(1000); String info = “Information:”+ michael; String otherExample = michael;//won’t compile
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Interesting Fact Can invoke superclass toString method: public String toString( ) { return super.toString( ) + “[ transactions: ” + transactioncount + “]”; }
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Overriding equals( ) To override, the signature must be exact: public boolean equals ( Object other) { }
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BankAccount equals public equals (Object other) { if (other == null) return false; if (getClass( ) != other.getClass( ) ) return false; //more }
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BankAccount equals public equals (Object other) { if (other == null) return false; if (getClass( ) != other.getClass( ) ) return false; //more }
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BankAccount equals
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