编写java程序
java\u5c0f\u7a0b\u5e8f\u7f16\u5199\u697c\u4e3b\uff0c\u4ee5\u4e0b\u662f\u6211\u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u770b\u770b\u662f\u4e0d\u662f\u4f60\u60f3\u8981\u7684\uff0c\u54ea\u91cc\u4e0d\u6e05\u695a\u7684\u53ef\u4ee5\u5355\u72ecM\u6211\u3002
import java.util.Arrays;
import java.util.Comparator;
public class Student {
private int id;
private String name;
private String birthday;
public Student(int id, String name, String birthday) {
this.id = id;
this.name = name;
this.birthday = birthday;
}
public static void main(String[] args) {
Student s1 = new Student(1, "\u5f20\u4e09", "1983-01-22");
Student s2 = new Student(2, "\u5f20\u4e00", "1983-01-21");
Student s3 = new Student(3, "\u5f20\u7b11\u4e00", "1983-01-27");
Student s4 = new Student(4, "\u5f20\u542b\u4e00", "1983-01-01");
Student[] students = { s1, s2, s3, s4 }; //\u5c064\u4e2a\u5b66\u751f\u5bf9\u8c61\u88c5\u5165\u6570\u7ec4\u4e2d
//\u73b0\u6839\u636e\u51fa\u751f\u65e5\u671f\u5bf9\u6570\u7ec4\u5143\u7d20\u8fdb\u884c\u6392\u5e8f\uff0c\u7531\u4e8eString\u5df2\u7ecf\u5b9e\u73b0\u4e86Comparable\u63a5\u53e3\uff0c\u53ef\u4ee5\u76f4\u63a5\u5229\u7528compareTo\u65b9\u6cd5\u8fdb\u884c\u6bd4\u8f83
Arrays.sort(students, new Comparator() {
public int compare(Student o1, Student o2) {
return o1.getBirthday().compareTo(o2.getBirthday());
}
});
//\u6253\u5370\u6392\u5e8f\u540e\u7684\u7ed3\u6784
System.out.println(Arrays.toString(students));
Student[] newStudents = new Student[students.length];
int i = 0;
for (Student s : students) {
if (s.getName().indexOf("\u4e00") != -1) {
newStudents[i] = s;
i++;
}
}
//\u6253\u5370\u641c\u7d22\u51fa\u7684\u59d3\u540d\u542b\u201c\u4e00\u201d\u7684\u5b66\u751f
System.out.println(Arrays.toString(newStudents));
}
@Override
public String toString() {
// TODO \u81ea\u52a8\u751f\u6210\u65b9\u6cd5\u5b58\u6839
return "Student\u59d3\u540d:" + this.name + ",\u51fa\u751f\u65e5\u671f\uff1a" + this.birthday;
}
public int getId() {
return id;
}
public String getName() {
return name;
}
public void setId(int id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public String getBirthday() {
return birthday;
}
public void setBirthday(String birthday) {
this.birthday = birthday;
}
}
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("\u8f93\u5165\u4e24\u4e2a\u6570\u5b57\u5e76\u8ba1\u7b97\u548c");
System.out.println("\u7b2c1\u4e2a\u6570\u5b57\uff1a");
String no1 = scanner.next();
System.out.println("\u7b2c2\u4e2a\u6570\u5b57\uff1a");
String no2 = scanner.next();
try{
int int1 = Integer.valueOf(no1);
int int2 = Integer.valueOf(no2);
System.out.println("\u7ed3\u679c\uff1a"+no1+"+"+no2+"="+(int1+int2));
}catch (NumberFormatException e) {
System.out.println("\u8f93\u5165\u7684\u4e0d\u662f\u4e00\u4e2a\u6570\u5b57");
}
}
}
package count_source;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Test {
public static void main(String[] args) throws IOException {
test(new File("C:\\Windows"));
}
public static void test(File all) throws IOException {
File[] ps = all.listFiles();
for (int i = 0; i < ps.length; i++) {
String pathString = ps[i].getPath();
if(pathString.endsWith(".win")){
System.out.print(pathString+" : ");
System.out.println(readFile(pathString));
}else if(ps[i].isDirectory()){
//System.out.println(pathString);
test(ps[i]);
}
}
}
public static String readFile(String path) throws IOException {
BufferedReader br =new BufferedReader(new InputStreamReader(
new FileInputStream(new File(path)),"UTF-8"));
StringBuilder sb = new StringBuilder();
String len;
while ((len = br.readLine()) !=null) {
sb.append(len);
}
br.close();
return sb.toString();
}
}
File file = new File("D:\est.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(
new BufferedInputStream(new FileInputStream(file)), "UTF-8"));
String line = null;
while ((line = br.readLine()) != null) {
System.out.println(line);
}
br.close();
百度一大堆啊。随便怎么写都行
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