EBWB - Enclosing Body Within a Block

The statement of a loop must always be a block. The then and else parts of if -statements must always be blocks. This makes it easier to add statements without accidentally introducing bugs due to forgetting to add braces.

Wrong

if( st == null )
    return;
while( st.countTokens() > 2 )
    s += st.nextToken();

Tip: Always enclose body within a block

Right

if( st == null ) {
    return;
}
while( st.countTokens() > 2 ) {
    s += st.nextToken();
}