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1. 编写程序接收用户输入分数信息,如果分数在0—100之间,输出成绩。如果成绩不在该范围内,抛出异常信息,提示分数必须在0—100之间。
要求:使用自定义异常实现。
import java.util.Scanner;
public class ScoreException01 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println(“请问您需要输入分数的个数:”);
int num = input.nextInt();
Student[] s = new Student[num];
for (int i = 0; i < s.length; i++) {
s[i] = new Student();
}
for (int i = 0, j = 0; j < s.length; i++) {
System.out.println("请输入分数:");
int score = input.nextInt();
try {
s[j++].setScore(score);
} catch (ScoreInputException e) {
e.printStackTrace();
j--;// 用于去除因为异常而未输入的数组中的空位
continue;
}
}
input.close();
System.out.println("输入的分数为:");
for (int i = 0; i < s.length; i++) {
System.out.print(s[i].getScore() + " ");
}
}
}
class ScoreInputException extends Exception {// 自定义一个异常
public ScoreInputException() {
}
public ScoreInputException(String message) {
super(message);
}
}
class Student {
private int score;
public Student() {
}
public Student(int Score) {
try {
this.setScore(Score);
} catch (ScoreInputException e) {
e.printStackTrace();
}
}
public void setScore(int score) throws ScoreInputException {// 手动抛出一个异常对象
if (score < 0 || score > 100) {
throw new ScoreInputException("您输入的分数有误,输入的分数必须是0-100之间,请重新输入!");
} else {
this.score = score;
}
}
public int getScore() {
return this.score;
}
}
2. 写一个方法void isTriangle(int a,int b,int c),判断三个参数是否能构成一个三角形, 如果不能则抛出异常IllegalArgumentException,显示异常信息 “a,b,c不能构成三角形”,如果可以构成则显示三角形三个边长,在主方法中得到命令行输入的三个整数, 调用此方法,并捕获异常。
import java.util.Scanner;
public class TestTriangle {
public static void main(String[] args) {
TestTriangle testTriangle = new TestTriangle();
Scanner input = new Scanner(System.in);
int[] count = new int[3];
char[] angle = { ‘a’, ‘b’, ‘c’ };
boolean flag = true;
while (flag) {
for (int i = 0; i < angle.length; i++) {
System.out.println(“请输入” + angle[i] + “的边长:”);
count[i] = input.nextInt();
}
try {
testTriangle.isTriangle(count[0], count[1], count[2]);
flag = false;
} catch (IllegalArgumentException e) {
e.printStackTrace();
flag = true;
System.out.println(“**请重新输入**”);
}
}
input.close();
System.out.println("你输入的三角形三个边长分别为:");
for (int c : count) {
System.out.print(c + " ");
}
}
class IllegalArgumentException extends Exception {
public IllegalArgumentException() {
}
public IllegalArgumentException(String message) {
super(message);
}
}
public void isTriangle(int a, int b, int c) throws IllegalArgumentException {
if (a + b <= c || a + c <= b || b + c <= a) {
throw new IllegalArgumentException("a,b,c不能构成三角形");
}
}
}
3. 编写一个计算N个学生分数平均分的程序。程序应该提示用户输入N的值,如何必须输入所有N个学生分数。如果用户输入的分数是一个负数,则应该抛出一个异常并捕获,提示“分数必须是正数或者0”。并提示用户再次输入该分数。
import java.util.Scanner;
public class ScoreAverageException03 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println(“请问您需要输入分数的个数:”);
int num = input.nextInt();
Student01[] s = new Student01[num];
for (int i = 0; i < s.length; i++) {
s[i] = new Student01();
}
for (int i = 0, j = 0; j < s.length; i++) {
System.out.println("请输入分数:");
int score = input.nextInt();
try {
s[j++].setScore(score);
} catch (ScoreInputException01 e) {
e.printStackTrace();
j--;// 用于去除因为异常而未输入的数组中的空位
continue;
}
}
input.close();
System.out.println("输入的分数为:");
int sum=0;
for (int i = 0; i < s.length; i++) {
System.out.print(s[i].getScore() + " ");
sum+=s[i].getScore();
}
double avg=(sum/num)*1.0;
System.out.println("您输入分数的平均数为:"+avg);
}
}
class ScoreInputException01 extends Exception {// 自定义一个异常
public ScoreInputException01() {
}
public ScoreInputException01(String message) {
super(message);
}
}
class Student01 {
private int score;
public Student01() {
}
public Student01(int Score) {
try {
this.setScore(Score);
} catch (ScoreInputException01 e) {
e.printStackTrace();
}
}
public void setScore(int score) throws ScoreInputException01 {// 手动抛出一个异常对象
if (score < 0 ) {
throw new ScoreInputException01("您输入的分数有误,输入的分数必须是正数或者是0,请重新输入!");
} else {
this.score = score;
}
}
public int getScore() {
return this.score;
}
}