顺序结构public static void main(String[] args) { System.out.println("hello01"); System.out.println("hello02"); System.out.println("hello03"); System.out.println("hello04"); System.out.println("hello05"); }}if单选择结构public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.println("请输入内容:"); String s = scanner.nextLine(); if (s.equals("hello")){ System.out.println(s); } System.out.println("End"); scanner.close(); }if双选择结构public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.println("请输入成绩:"); int score = scanner.nextInt(); if (score>=60){ System.out.println("及格"); }else{ System.out.println("不及格"); } scanner.close(); }