java 类和对象，循环，数组类：就是由关键字class生成的类对象：就是由类实例化出来的具体对象

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类：就是由关键字class生成的类

对象：就是由类实例化出来的具体对象

student.java //这是一个学生类

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package com.yangliwei;

public class student
{
    String name;
    int age;
    float shengao;
    int xuehao;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public float getShengao() {
        return shengao;
    }

    public void setShengao(float shengao) {
        this.shengao = shengao;
    }

    public int getXuehao() {
        return xuehao;
    }

    public void setXuehao(int xuehao) {
        this.xuehao = xuehao;
    }

    @Override
    public String toString() {
        return "student{" +
                "name='" + name + ''' +
                ", age=" + age +
                ", shengao=" + shengao +
                ", xuehao=" + xuehao +
                '}';
    }
    public void out(String a){
        System.out.println(a);
    }
}

test.java //是一个main方法，里面实例化出来了一个学生类

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package com.yangliwei;

public class test {
    public static void main(String[] args) {
        student stu1 = new student();
        stu1.setName("杨利伟");
        stu1.setAge(21);
        stu1.setXuehao(100001);
        stu1.setShengao(180.0F);
        System.out.println(stu1.toString());
        stu1.out("yangliwei");
    }
}

循环

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public static void forxunhuan(){
        int sum = 0 ;
        for (int i = 0;i<=100;i++){
            sum += i;
        }
        System.out.println(sum);
    }
    public static void whilexunhuan(){
        int sum = 0 ;
        int i = 0;
        while(i<=100){
            sum +=i;
            i++;
        }
        System.out.println(sum);
    }
    public static void dowhile(){
        int sum = 0 ;
        int i = 0;
        do{
            sum+=i;
            i++;
        }while(i<=100);
        System.out.println(sum);
    }

数组

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public static void array(){
        int[] a = {123,234,345,234,1234};
        for (int i =0;i<=a.length-1;i++){
            System.out.print(a[i]+",");
        };
    }