代码如下,随便附一句,一定要看写的源码,我已经尽量马马虎虎的写了,你更容易看懂。
public class Test {// 第八题
public static final int NUM = 100
public static final double GOOD = 99.99
public static final String CLASSNAME = "Test.Class"
public static final long MAX = 9999999
public static void main(String[] args) {
// 第一题
byte byte1 = 1
short short1 = 1
int int1 = 1
long long1 = 1
float float1 = 1
double double1 = 1.0
System.out.println("byte1 - " + byte1)
System.out.println("short1 - " + short1)
System.out.println("int1 - " + int1)
System.out.println("long1 - " + long1)
System.out.println("float1 - " + float1)
System.out.println("double1 - " + double1)
// 第二题
String name
char sex
int age
boolean isMember
// 第三题
int score1
double score2 = 98.5
// 第四题
double f1 = 10.1, f2 = 34.2
System.out.println("f1,f2的和:" + (f1 + f2))
System.out.println("f1,f2的差:" + (f1 - f2))
System.out.println("f1,f2的积:" + (f1 * f2))
System.out.println("f1,f2的商:" + (f1 / f2))
// 第五题
int f3 = 5
double f4 = 45.6
System.out.println("f3,f4的和:" + (f3 + f4))
System.out.println("f3,f4的差:" + (f3 - f4))
System.out.println("f3,f4的积:" + (f3 * f4))
System.out.println("f3,f4的商:" + (f3 / f4))
// 第六题
int A = 65
char a = (char) A
System.out.println("整型互转char:" + a)
// 第七题
double timor = 123.456789
int x = Integer
.parseInt(new java.text.DecimalFormat("0").format(timor))// 四舍五入
System.out.println("double -> int :" + x)
// 第八题(定义在最开始)
System.out.println("常量NUM的值: " + NUM)
System.out.println("常量GOOD的值: " + GOOD)
System.out.println("常量CLASSNAME的值: " + CLASSNAME)
System.out.println("常量MAX的值: " + MAX)
// 第九题(自定义商品类)
class Goods {
private String name
private double price
private int count
private double total
public Goods(String name, double price, int count) {
this.name = name
this.price = price
this.count = count
}
public void print() {
total = price * count
System.out.println("商品名 价格 数量 总价")
System.out.println(name + " " + price + " " + count + " "
+ total)
}
}
Goods goods = new Goods("苹果", 2, 10)
goods.print()
// 第十题
double pi = 3.14, r, d
r = 4
d = 2 * r
System.out.println("圆的周长: " + (pi * d))
System.out.println("圆的面积: " + (pi * r * r))
// 第十一题
String qqname = "1234567890"
String qqpassword = "asd!#@#$%66"
Date birth = new Date(2014, 5, 1)
boolean isVIP = false
char sex1 = '男'
StringBuilder personInfo = new StringBuilder()
personInfo.append("我是一个快乐的骚年")
personInfo
.append("然后a!#$%^&*asdasdasdasdsa9d87a9s8d79asdjidauisdhausdihiasd")
// 第十二题
class Swaper {
public void change(int num1, int num2) {
int temp = num1
num1 = num2
num2 = temp
System.out.printf("a=%d,b=%d\n", num1, num2)
}
}
int a1 = 2
int b1 = 5
Swaper swaper = new Swaper()
swaper.change(a1, b1)
}
}
通过Eclipse运行程序 启动Eclipse,在菜单中选择“文件->新建->Java项目”,d出对话框: 填入项目名称,点击“完成”,创建项目成功,可以看到在 E:\java\workspace 目录下多出了一个Demo文件夹。欢迎分享,转载请注明来源:内存溢出
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