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  • Hello World

     

    Helloworld
    package
    HelloWorld; public class Main { public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("Hello World"); } }
    int类型的1+1

    import
    java.util.Scanner; public class Main { public static void main(String[] args) { // TODO Auto-generated method stub Scanner Ind = new Scanner(System.in); int a=Ind.nextInt(); int b=Ind.nextInt(); System.out.println(a+b); } }
    数组的定义与使用
    Scanner Ind = new Scanner(System.in); int[] a=new int[10];///一维数组
         ///int[][] a = new int[20][20] 二维数组的定义 a[
    0]=Ind.nextInt(); a[1]=Ind.nextInt(); System.out.println(a[0]+a[1]);
    package BuyCar;
    
    public class Tcar {///建造一个汽车类   并且进行调用
        public static void main(String[] args) {
            Car c1 = new Car();
            c1.info();
            c1.info("baoma",4);
            System.out.println(c1.getName());
            c1.info();
            
            
            Factory f=new Factory();
            Car c2=f.newCar();
            c2.info();
            Car c3=f.newCar("aodi", 6);
            c3.info();
            f.chakan(c3);
        }
    }
    class Factory{
        public Car newCar() {
            return new Car();
        }
        public Car newCar(String s,int a) {
            Car ans=new Car();
            ans.name=s;
            ans.wheel=a;
            return ans;
        }
        public void chakan(Car a) {
            a.info();
        }
    }
    class Car {
        String name;///属性
        int wheel;
        public void info() {///方法
            System.out.println("name:"+name+",wheel:"+wheel);
        }
        public void info(String str,int a) {
            name=str;wheel=a;
        }
        public String getName() {
            return name;
        }
    }  输出:

    name:null,wheel:0
    baoma
    name:baoma,wheel:4
    name:null,wheel:0
    name:aodi,wheel:6
    name:aodi,wheel:6

     
    package AddSum;///JDK新特性之可变个数的形参的方法
    
    public class Add {
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            Add sum=new Add();
            System.out.println(sum.getSum(1,2,3,4));
            System.out.println(sum.getStr("qwe","asd","zxcc"));
    
        }
        public int getSum(int ... args){
            int sum=0;
            for(int i=0;i<args.length;i++)
                sum+=args[i];
            return sum;
        }
        public String getStr(String ... s) {
            String str=new String();for(int i=0;i<s.length;i++)
                str=str+s[i];
            return str;
        }
    }

    10
    qweasdzxcc

    
    
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  • 原文地址:https://www.cnblogs.com/a719525932/p/9366239.html
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