網(wǎng)易微專業(yè) Java開(kāi)發(fā)工程師(Web方向)

安裝Eclipse和Java SRE

Hello.java

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package hello;

import java.util.Scanner;

public class Hello {
  
    public static void main(String[] args) {      
        System.out.println("Hello World");  //print line 換行
        Scanner in = new Scanner(System.in);    //準(zhǔn)備讀取條件
        int price = 0;
        price = in.nextInt();   //正式讀取整數(shù)
        System.out.println("100-"+price+"+"+(100-price));
    }
  
}

final int amount = 100; //常量

inch = in.nextDouble(); //讀取浮點(diǎn)數(shù)

判斷浮點(diǎn)數(shù)是否相等 Math.abs(f1 - f2) < 0.00001;
判斷

Scanner in = new Scanner(System.in);
int type = in.nextInt();
switch(type)
{
  case 1:
  case 2:
        System.out.println("你好");
        break;
  case 3:
        System.out.println("晚上好");
        break;
  case 4:
  default:

}

判斷
while 當(dāng)

int 4byte
[-2³¹ ~2³¹ -1]

for == while

for (int i = 1; i <= n; i = i+1)
{
    factor = factor * i;
}

            ||
            ||

    int i = 1;
    while (i <= n)
    {
        factor = factor * i;
        i = i + 1;
    }