関連ワード:  how to empty stringbuffer in java    how to empty stringbuilder in java    how to clear string buffer in java    how to clear string buffer in java with syntax    how to clear stringbuilder in java    how to delete stringbuilder in java    how to flush stringbuilder in java    how to create empty stringbuilder in java    how to make stringbuilder empty in java    how to set stringbuilder empty in java