public PolicyVariables clearRuleVariablesEntries() {
        this.ruleVariables = null;
        return this;
    }
Removes all the entries added into RuleVariables.

@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-networkfirewall/src/main/java/com/amazonaws/services/networkfirewall/model/PolicyVariables.java