java练习题(含答案)

1. 编写程序,用数组实现乘法小九九的存储和输出。【提示:采用多个一维数组。】 public class Multipation {

public static void main(String[] args) { // TODO Auto-generated method stub int x[][]=new int[9][9]; for(int i=0;i<9;i++){ for(int j=0;j<9;j++){ if(i>=j){ int m=i+1; }

}

}

int n=j+1;

x[i][j]=m*n;

System.out.print(m+\+n+\+x[i][j]);

}

}

System.out.println();

2. 定义一个类Student,属性为学号、姓名和成绩;方法为增加记录SetRecord和得到记录GetRecord。SetRecord给出学号、姓名和成绩的赋值,GetRecord通过学号得到考生的成绩。

public class Student { }

/**

* @param args */

private int ID; private String name; private float score;

public void SetRecord(int ID,String name,float score){ }

public float getRecord(int ID){ }

if(ID==this.ID) return this.score; else return -1; }

// TODO Auto-generated method stub Student s=new Student(); s.SetRecord(0,\,100); float Sco=s.getRecord(0); System.out.print(Sco); this.ID=ID; this.name=name; this.score=score;

public static void main(String[] args) {

3. 给出上题中设计类的构造函数,要求初始化一条记录(学号、姓名、成绩)。

4. public class Student { 5. 6. /**

7. * @param args 8. */

9. private int ID; 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. }

public static void main(String[] args) { }

// TODO Auto-generated method stub Student s=new Student(0,\,12); //s.SetRecord(0,\ float Sco=s.getRecord(0); System.out.print(Sco); private String name; private float score;

Student(int ID,String name,float score){ }

public void SetRecord(int ID,String name,float score){ }

public float getRecord(int ID){

if(ID==this.ID) return this.score; else return -1; }

this.ID=ID; this.name=name; this.score=score;

this.ID=0; this.name=\; this.score=65;

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