三道JAVA程序编写
public class JavaPractise {
public static void main(String[] args) {
JavaPractise o = new JavaPractise();
String str = "1342973451345";
String subStr = o.getMaxLengthAddPart(str);
System.out.println(subStr);
String binaryFlow = "000011110000011111";
String sameSubStr = o.getMaxSameSubStr(binaryFlow);
System.out.println(sameSubStr);
String letterFlow = "aaBBBcCCCCddddddEEEE";
String sameLettersSubStr = o.getMaxSameLettersSubStr(letterFlow);
System.out.println(sameLettersSubStr);
}
/**
* 校验字符串是否符合数字规范
* */
private boolean isNum(String str){
boolean result = true;
if(str.length() < 1)
return false;
for(int i = 0 ; i < str.length(); i ++){
if(str.charAt(i) '9')
return false;
}
return result;
}
private boolean isBinaryFlow(String binaryFlow){
boolean result = true;
if(binaryFlow.length() < 1)
return false;
for(int i = 0 ; i < binaryFlow.length(); i ++){
if(binaryFlow.charAt(i) != '0' && binaryFlow.charAt(i) != '1')
return false;
}
return result;
}
private boolean isLetterFlow(String letterFlow){
boolean result = true;
if(letterFlow.length() < 1)
return false;
for(int i = 0 ; i < letterFlow.length(); i ++){
char cur = letterFlow.charAt(i);
if(!( ('z'>= cur && cur >= 'a') || ('Z' >= cur && cur > 'A') ) )
return false;
}
return result;
}
/**
* 获取最长增长数字的子串
* */
private String getMaxLengthAddPart(String str){
str = str.trim();
if(!isNum(str))
return "";
String temp = ""+str.charAt(0);
String maxSubStr = temp;
for(int i = 1; i < str.length(); i++){
char curChar = str.charAt(i);
char lastChar = str.charAt(i-1);
if( curChar > lastChar){
temp += curChar;
if(i != (str.length()-1))
continue;//如果当前节点为最后一个节点，那么强制进入下面环节，进行
}
maxSubStr = maxSubStr.length()> temp.length() ? maxSubStr : temp;
temp = ""+curChar; //清空原数据，并从当前节点记录
}
return maxSubStr;
}
/**
* 二进制流最长字符串判定
* */
private String getMaxSameSubStr(String str){
str = str.trim();
if(!isBinaryFlow(str))
return "";
String temp = ""+str.charAt(0);
String maxSubStr = temp;
for(int i = 1; i < str.length(); i++){
char curChar = str.charAt(i);
char lastChar = str.charAt(i-1);
if( curChar == lastChar){
temp += curChar;
if(i != (str.length()-1))
continue;//如果当前节点为最后一个节点，那么强制进入下面环节，进行
}
maxSubStr = maxSubStr.length()> temp.length() ? maxSubStr : temp;
temp = ""+curChar; //清空原数据，并从当前节点记录
}
return maxSubStr;
}
/**
* 字符串的最长相同部分截取
* */
private String getMaxSameLettersSubStr(String str){
str = str.trim();
if(!isLetterFlow(str))
return "";
String temp = ""+str.charAt(0);
String maxSubStr = temp;
for(int i = 1; i < str.length(); i++){
char curChar = str.charAt(i);
char lastChar = str.charAt(i-1);
if( curChar == lastChar){
temp += curChar;
if(i != (str.length()-1))
continue;//如果当前节点为最后一个节点，那么强制进入下面环节，进行
}
maxSubStr = maxSubStr.length()> temp.length() ? maxSubStr : temp;
temp = ""+curChar; //清空原数据，并从当前节点记录
}
return maxSubStr;
}
}
运行结果如下：
package TestPerson;/** * (1) 编写程序实现如下功能：已知Person类包含三个公共成员变量（姓名、性别、年龄）和一个构造方法， * Student类是Person类的派生类，包含两个新的公共成员变量(学号、班号)、两个公共方法（修改年龄、显示基本信息）及一个构造方法。 * 在测试类Test1中，定义一组学生对象，并初始化他们的基本信息，然后依次输出。 */public class Test1 {public static void main(String[] args) {Student[] student = new Student[3];student[0] = new Student("小李", "男", 12, 20181101, 01);student[1] = new Student("小南", "女", 13, 20001102, 01);student[2] = new Student("小李", "男", 12, 20181103, 01);for(Student stu : student) {stu.showInformation();}}}class Person {public String name;public String sex;public int age;public Person(String name, String sex, int age) {super();this.name = name;this.sex = sex;this.age = age;}}class Student extends Person {public long studentId;public long classId;public void setAge(int age) {age = this.age;}public void showInformation() {System.out.println("我的姓名是" + name + "," + "我的性别是" + sex + "," + "我的年龄是" + age + "岁," + "我的学号是" + studentId + "," + "我的班号是" + classId + "班");}public Student(String name, String sex, int age, long studentId,long classId) {super(name, sex, age);this.studentId = studentId;this.classId = classId;}}不可否认，我现在是有点闲，所以我就帮你写第一个吧，至于后面两个，我就不写了，看看还有没有其他人有点闲时间，看缘分吧
运行结果：
我的姓名是小李,我的性别是男,我的年龄是12岁,我的学号是20181101,我的班号是1班
我的姓名是小南,我的性别是女,我的年龄是13岁,我的学号是20001102,我的班号是1班
我的姓名是小李,我的性别是男,我的年龄是12岁,我的学号是20181103,我的班号是1班
public class Customer {
private String custId;
private String custName;
private char custGender;
public Customer() {
this("DefaultId", "DefaultName", 'F');
}
public Customer(String custId, String custName, char custGender) {
this.custId = custId;
this.custName = custName;
this.custGender = custGender;
}
public String getCustId() {
return this.custId;
}
public void setCustId(String custId) {
this.custId = custId;
}
public String getCustName() {
return this.custName;
}
public void setCustName(String custName) {
this.custName = custName;
}
public char getCustGender() {
return this.custGender;
}
public void setCustGender(char custGender) {
this.custGender = custGender;
}
public void printMSG() {
System.out.println("CustId：" + this.custId);
System.out.println("CustName：" + this.custName);
System.out.println("CustGender：" + this.custGender);
}
}
public class Account {
private String accountId;
private String accountNo;
private float balance;
public Account() {
this("Default", "Default");
}
public Account(String accountId, String accountNo) {
this(accountId, accountNo, 0.0F);
}
public Account(String accountId, String accountNo, float balance) {
this.accountId = accountId;
this.accountNo = accountNo;
this.balance = balance;
}
public void deposit(float amount) {
if (amount >= 0) {
this.balance + amount;
}
}
public void withdraw(float amount) {
if (amount >= 0 && amount <= this.balance) {
this.balance - amount;
}
}
public float getBalance() {
return this.balance;
}
}
public class Ex4_3 {
public static void main(String[] args) {
Customer z = new Customer("ZhangSan", "张三", 'F');
Customer l = new Customer("LiSi", "李四", 'M');
Account aZ = new Account(z.getCustId(), "ZhangSanAccountA", 2000.0F);
Account bZ = new Account(z.getCustId(), "ZhangSanAccountB");
Account aL = new Account(l.getCustId(), "LiSiAccount", 3000.0F);
aZ.withdraw(500.0F);
aZ.withdraw(1000.0F);
bZ.deposit(1000.0F);
aL.withdraw(300.0F);
z.printMSG();
System.out.println("余额：");
System.out.println(aZ.getBalance());
System.out.println(bZ.getBalance());
System.out.println("===============");
l.printMSG();
System.out.println("余额：");
System.out.println(aL.getBalance());
}
}未测试
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