0_0_30566360_9942\Main.java:2: 错误: 需要class, interface或enum a.add(sb.toString()); ^ 0_0_30566360_9942\Main.java:3: 错误: 需要class, interface或enum sb.delete(0, sb.length()); ^ 0_0_30566360_9942\Main.java:4: 错误: 需要class, interface或enum } ^ 3 个错误