Utilize instanceof no equals() antes da conversão.
public InstanceofEquals_Solution( String str ) {
super();
this .str = str;
}
public String getString(){
return str;
}
public int hashCode(){
return str.hashCode();
}
public boolean equals(
Object other ) {
return ( other instanceof InstanceofEquals_Solution) &&
str.equals( ( (InstanceofEquals_Solution)other ).getString() );
}
private String str;
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