实验一 Java编程环境使用
第1关 String类的常用方法package step1;
public class StringExample {
public static void main(String args[]) {
/********* Begin *********/
String s1 = new String("you are a student"),
s2 = new String("how are you");
if (s1.equals(s2)) // 使用equals方法判断s1与s2是否相同
{
System.out.println("s1与s2相同");
} else {
System.out.println("s1与s2不相同");
}
String s3 = new String("22030219851022024");
if (s3.startsWith("220302")) // 判断s3的前缀是否是“220302”
{
System.out.println("吉林省的身份证");
}
String s4 = new String("你"), s5 = new String("我");
if (s4.compareTo(s5) > 0)// 按着字典序s4大于s5的表达式
{
System.out.println("按字典序s4大于s5");
} else {
System.out.println("按字典序s4小于s5");
}
int position = 0;
String path = "c:\\java\\jsp\\A.java";
position = path.lastIndexOf("\\"); // 获取path中最后出现\\的位置
System.out.println("c:\\java\\jsp\\A.java中最后出现\\的位置:" + position);
String fileName = path.substring(path.lastIndexOf("\\") + 1); // 获取path中“A.java”子字符串
System.out.println("c:\\java\\jsp\\A.java中含有的文件名:" + fileName);
String s6 = new String("100"), s7 = new String("123.678");
int n1 = Integer.parseInt(s6); // 将s6转化成int型数据
double n2 = Double.parseDouble(s7); // 将s7转化成double型数据
double m = n1 + n2;
System.out.println(m);
String s8 = String.valueOf(m); // String调用valueOf(m)方法将m转化为字符串对象
position = s8.indexOf(".");
String temp = s8.substring(position + 1); // 获取s8中小数点后面的小数
System.out.println("数字" + m + "有" + temp.length() + "位小数");
String s9 = new String("ABCDEF");
char a[] = s9.toCharArray();// 将s9存放到数组a中
for (int i = a.length - 1; i >= 0; i--) {
System.out.print(" " + a);
}
/********* End *********/
}
}第2关 矩阵转置
package step2;
import java.util.Scanner;
public class SwapMatrix {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int[][] matrix = new int;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
matrix = scanner.nextInt();
}
}
/********** Begin **********/
System.out.println("原始数组为：");
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
System.out.print(matrix + " ");
}
System.out.println();
}
int[][] transposedMatrix = new int;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
transposedMatrix = matrix;
}
}
System.out.println("行列互调后数组为：");
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
System.out.print(transposedMatrix + " ");
}
System.out.println();
}
/********** End **********/
scanner.close();
}
}第3关 求平均分及各个区间段的人数
package step3;
import java.util.Scanner;
public class Score {
public static void main(String args[]) {
Scanner scanner = new Scanner(System.in);
/********** Begin **********/
int excellent = 0; // 优秀人数
int good = 0; // 良好人数
int medium = 0; // 中等人数
int pass = 0; // 及格人数
int fail = 0; // 不及格人数
double sum = 0; // 总成绩
double score; // 学生成绩
int count = 0; // 学生总人数
while (true) {
score = scanner.nextDouble();
if (score == -1) {
break;
}
count++;
sum += score;
if (score >= 90) {
excellent++;
} else if (score >= 80) {
good++;
} else if (score >= 70) {
medium++;
} else if (score >= 60) {
pass++;
} else {
fail++;
}
}
System.out.println("不及格的人数为：" + fail);
System.out.println("及格的人数为：" + pass);
System.out.println("中等的人数为：" + medium);
System.out.println("良好的人数为：" + good);
System.out.println("优秀的人数为：" + excellent);
System.out.printf("全班平均分为：%.1f\n", sum / count);
/********** End **********/
scanner.close();
}
}
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