JAVA的数据类型

 

boolean

byte

short

char

int

long

float

double

以上的八种是基本数据类型

 

 

String        是一种类类型

[]      数组类型

以上两种数据类型合称为引用数据类型

 

 

通常在给类赋值是用 set...

 

取值时通常是用 get...

 

例：

public class person{

    private String name;

    private String sex;

    private int age;

public void setName(String n){

    name=n;

    }

public void setSex(String s){

    sex=s;

    }

public void SetAge(int a){

    age=a;

    }

public String getName(){

    return name;

    }

public String getSex(){

    return sex;

    }

public int getAge(){

    return age;

    }

public String toString(){

    return name+" "+sex+" "+age;

    }

}

 

 

引用

public class personsort{

    public static void main(String args[]){

                        //定义对象数组

        person p[]=new person[5];

        for(int i=0;i<p.length;i++){

            p[i]=new person();

        }

 

        String name[]={"zhangsan","lisi","wangwu","zhaoliu","tianqi"};

        String sex[]={"man","man","woman","man","woman"};

        int age[]={21,22,20,19,23};

                        //赋值

        for(int i=0;i<p.length;i++){

            p[i].setName(name[i]);

            p[i].setSex(sex[i]);

            p[i].setAge(age[i]);

        }

                        //排序

        for(int i=0;i<p.length;i++){

            for(int j=0;j<p.length-1-i;j++){

                if(p[j].getAge()>p[j+1].getAge()){

                    person pp=p[j];

                    p[j]=p[j+1];

                    p[j+1]=pp;

                }

            }

                        //输出

        for(int i=0;i<p.length;i++){

            System.out.println(p[i].toString());

        }

    }

}