class Dater{
int year;
int month;
int day;
void setYear(int yy){year=yy;}
void setMonthz(int mm){month=mm;}
void setDay(int dd){day=dd;}
void setDater(int yy,int mm, int dd){
year=yy;
month=mm;
day=dd;
}
int getYear(){return year;}
int getMonth(){return month;}
int getDay(){return day;}
}
class IDCard{
String name;
String sex;
String address;
String num;
Dater dater;
void setName(String pname){name=pname;}
void setSex(String psex){sex=psex;}
void setAddress(String paddress){address=paddress;}
void setNum(String pnum){num=pnum;}
void setDater(int y, int m, int d){
Dater dt= new Dater();
dt.setDater(y,m,d);
}
void setIDCard(String pname,String psex,String paddress,String pnum){
name=pname;
sex=psex;
address=paddress;
num=pnum;
}
String getName(){return name;}
String getSex(){return sex;}
String getAddress(){return address;}
String getNum(){return num;}
String getDater(){
int year;
int month;
int day;
Dater dt=new Dater();
year=dt.getYear();
month=dt.getMonth();
day=dt.getDay();
return year+"年"+month+"月"+day+"日";
}
}
public class Test{
public static final int ARRAY_LENGTH=10;
public static void main(String[] args){
IDCard[] person=new IDCard[ARRAY_LENGTH];
for (int n=0;n<ARRAY_LENGTH;n++){
person[n].setIDCard("XXX","男","天津XX大学","130XXXXXXXXXXXXX");
person[n].setDater(1987,n,28);
}
for(int m=0;m<ARRAY_LENGTH;m++){
System.out.println("姓名:"+person[m].getName());
System.out.println("性别:"+person[m].getSex());
System.out.println("出生日期:"+person[m].getDater());
System.out.println("家庭地址:"+person[m].getAddress());
System.out.println("身份证号:"+person[m].getNum());
}
}
}
int year;
int month;
int day;
void setYear(int yy){year=yy;}
void setMonthz(int mm){month=mm;}
void setDay(int dd){day=dd;}
void setDater(int yy,int mm, int dd){
year=yy;
month=mm;
day=dd;
}
int getYear(){return year;}
int getMonth(){return month;}
int getDay(){return day;}
}
class IDCard{
String name;
String sex;
String address;
String num;
Dater dater;
void setName(String pname){name=pname;}
void setSex(String psex){sex=psex;}
void setAddress(String paddress){address=paddress;}
void setNum(String pnum){num=pnum;}
void setDater(int y, int m, int d){
Dater dt= new Dater();
dt.setDater(y,m,d);
}
void setIDCard(String pname,String psex,String paddress,String pnum){
name=pname;
sex=psex;
address=paddress;
num=pnum;
}
String getName(){return name;}
String getSex(){return sex;}
String getAddress(){return address;}
String getNum(){return num;}
String getDater(){
int year;
int month;
int day;
Dater dt=new Dater();
year=dt.getYear();
month=dt.getMonth();
day=dt.getDay();
return year+"年"+month+"月"+day+"日";
}
}
public class Test{
public static final int ARRAY_LENGTH=10;
public static void main(String[] args){
IDCard[] person=new IDCard[ARRAY_LENGTH];
for (int n=0;n<ARRAY_LENGTH;n++){
person[n].setIDCard("XXX","男","天津XX大学","130XXXXXXXXXXXXX");
person[n].setDater(1987,n,28);
}
for(int m=0;m<ARRAY_LENGTH;m++){
System.out.println("姓名:"+person[m].getName());
System.out.println("性别:"+person[m].getSex());
System.out.println("出生日期:"+person[m].getDater());
System.out.println("家庭地址:"+person[m].getAddress());
System.out.println("身份证号:"+person[m].getNum());
}
}
}
person[n] = new IDCard();//添加部分--
person[n].setIDCard("XXX","男","天津XX大学","130XXXXXXXXXXXXX");
person[n].setDater(1987,n,28);
}
// 构造了指定长度的数组,但是数组中的每一个元素都是空对象
IDCard[] person=new IDCard[ARRAY_LENGTH];
for (int n=0;n<ARRAY_LENGTH;n++){
// person[n]==null 为真,即person[n]为空对象,下句报空指针异常
person[n].setIDCard("XXX","男","天津XX大学","130XXXXXXXXXXXXX");
1,public void setDater(int y, int m, int d) {
dater =new Dater();
dater.setDater(y, m, d);
}
2,String getDater() {
return dater.getYear() + "年" + dater.getMonth() + "月" + dater.getDay() + "日";
}
3,
for (int n = 0; n < ARRAY_LENGTH; n++) {
person[n] = new IDCard();
person[n].setIDCard("XXX", "男", "天津XX大学", "130XXXXXXXXXXXXX");
person[n].setDater(1987, n, 28);
}看看有什么不同 ~~
int year;
int month;
int day; public Dater(int year, int month, int day) {
this.year = year;
this.month = month;
this.day = day;
} public int getYear() {
return year;
} public int getMonth() {
return month;
} public int getDay() {
return day;
} public String toString() {
return year + "年" + month + "月" + day + "日";
}
}class IDCard {
String name;
String sex;
String address;
String num;
Dater dater; public IDCard(String name, String sex, String address, String num,Dater dater) {
this.name = name;
this.sex = sex;
this.address = address;
this.num = num;
this.dater = dater;
} String getName() {
return name;
} String getSex() {
return sex;
} String getAddress() {
return address;
} String getNum() {
return num;
} String getDater() {
return dater.toString();
} public String toString() {
String info = "";
info += "姓名:" + this.name + "\n";
info += "性别:" + this.sex + "\n";
info += "出生日期:" + this.getDater() + "\n";
info += "家庭地址:" + this.address + "\n";
info += "身份证号:" + this.num + "\n"; return info;
}
}public class Test {
public static final int ARRAY_LENGTH = 10; public static void main(String[] args) {
IDCard[] person = new IDCard[ARRAY_LENGTH]; for (int n = 0; n < ARRAY_LENGTH; n++) {
Dater dater = new Dater(1987, n, 28);
person[n] = new IDCard("XXX", "男", "天津XX大学", "130XXXXXXXXXXXXX",dater);
} for (int m = 0; m < ARRAY_LENGTH; m++) {
System.out.println(person[m].toString());
}
}
}