Avoid using for statements without using curly braces, like for (int i=0; i<42;i++) foo();

src/main/java/com/alibaba/druid/sql/ast/SQLObjectImpl.java

@@ -48,8 +48,9 @@ public abstract class SQLObjectImpl implements SQLObject, Serializable {
     protected abstract void accept0(SQLASTVisitor visitor);
 
     protected final void acceptChild(SQLASTVisitor visitor, List<? extends SQLObject> children) {
-        for (SQLObject child : children)
+        for (SQLObject child : children) {
             acceptChild(visitor, child);
+        }
     }
 
     protected final void acceptChild(SQLASTVisitor visitor, SQLObject child) {

src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java

@@ -187,8 +187,9 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter {
     }
 
     public void printIndent() {
-        for (int i = 0; i < this.indentCount; ++i)
+        for (int i = 0; i < this.indentCount; ++i) {
             print(this.indent);
+        }
     }
 
     public void println() {