System.out.println("=== Summary ===");
The screenshot app got some new icons for screenshot modes, and those modes now have text labels. Plus we now remember the last selected screenshot mode—perfect for when you’re taking multiple screenshots in a row.。关于这个话题，PDF资料提供了深入分析
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for (int start = 0; start < gap; start++) {
Each handshake message starts with a type and a length.