class JoinOn extends JoinCriteria {

    private final Expression expression;

    public JoinOn(Expression expression) {
        this.expression = requireNonNull(expression, "expression is null");
    }

    public Expression getExpression() {
        return expression;
    }

    @Override
    public boolean equals(Object o) {<FILL_FUNCTION_BODY>}

    @Override
    public int hashCode() {
        return Objects.hash(expression);
    }

    @Override
    public String toString() {
        return "JoinOn{" +
               "expression=" + expression +
               '}';
    }
}

        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        JoinOn joinOn = (JoinOn) o;
        return Objects.equals(expression, joinOn.expression);
    
<methods>public non-sealed void <init>() ,public abstract boolean equals(java.lang.Object) ,public abstract int hashCode() ,public abstract java.lang.String toString() <variables>