1 public class Practice1 {
 2     public static void main(String[] args){
 3                 //从控制台输入张三的成绩
 4         Scanner input = new Scanner(System.in);
 5         System.out.print("请输入张三的JAVA成绩：");
 6         int score = input.nextInt();
 7         if( score >98){
 8             System.out.println("老师说：不错，奖励一个MP4！");
 9         }
10     }
11 }    

 1 public class Practice2 {
 2     public static void main(String[] args){
 3         Scanner input = new Scanner(System.in);
 4         System.out.print("请输入张三的JAVA成绩：");
 5         int score = input.nextInt();
 6         if(score >98){
 7             System.out.println("老师说：不错，奖励一个MP4！");
 8         }else{
 9             System.out.println("老师说：罚抄试卷");
10         }
11     }
12 }

 1 public class Practice3 {
 2     public static void main(String[] args){
 3         Scanner input = new Scanner(System.in);
 4         System.out.println("请输入分数：");
 5         int score= input.nextInt();
 6         if(score== 100){
 7             System.out.println("父亲给她买辆车");
 8         }else if(score>= 90){
 9             System.out.println("母亲给她买一台笔记本电脑");
10         }else if(score>=60){
11             System.out.println("母亲给她买一台手机");
12         }else{
13             System.out.println("扣掉一个星期的生活费");
14         }
15     }
16 }

 1 public class Practice4 {
 2     public static void main(String[] args) {
 3         Scanner input = new Scanner(System.in);
 4         System.out.print("请输入比赛成绩(s):");
 5         double score = input.nextDouble();
 6         System.out.print("请输入性别");
 7         String gender = input.next();
 8         if(score<=10){
 9             if(gender.equals("男")){
10                 System.out.println("进入男子组决赛");
11             }else if(gender.equals("女")){
12                 System.out.println("进入女子组决赛");
13             }
14         }else{
15             System.out.println("淘汰");
16         }
17     }
18 }