1.1
public
class
Test{
public
static
void
main(String[] args){
System.
out
.println(
"Welcome to Java !"
)
System.
out
.println(
"Welcome to Computer Science !"
)
System.
out
.println(
"Programming is fun ."
)
}
}
1.2
public
class
Test{
public
static
void
main(String[] args){
for
(
int
i = 0i <= 4i++){
System.
out
.println(
"Welcome to Java !"
)
}
}
}
1.3
public
class
Test{
public
static
void
main(String[] args){
System.
out
.println(
" ]"
)
System.
out
.println(
" ]"
)
System.
out
.println(
"] ]"
)
System.
out
.println(
" ]]"
)
}
}
public
class
Test{
public
static
void
main(String[] args){
System.
out
.println(
" A"
)
System.
out
.println(
" A A"
)
System.
out
.println(
" AAAAA"
)
System.
out
.println(
"A A"
)
}
}
public
class
Test{
public
static
void
main(String[] args){
System.
out
.println(
"V V"
)
System.
out
.println(
" V V"
)
System.
out
.println(
" V V"
)
System.
out
.println(
" V"
)
}
}
1.4
public
class
Test{
public
static
void
main(String[] args){
System.
out
.println(
"a a^2 a^3"
)
System.
out
.println(
"1 1 1"
)
System.
out
.println(
"2 4 8"
)
System.
out
.println(
"3 9 27"
)
System.
out
.println(
"4 16 64"
)
}
}
1.5
public
class
Test{
public
static
void
main(String[] args){
System.
out
.println((9.5*4.5-2.5*3)/(45.5-3.5))
}
}
1.6
public
class
Test{
public
static
void
main(String[] args){
int
i = 1,sum = 0
for
(i <= 9i++)
sum += i
System.
out
.println(sum)
}
}
1.7
public
class
Test{
public
static
void
main(String[] args){
System.
out
.println(4*(1.0-1.0/3+1.0/5-1.0/7+1.0/9-1.0/11))
System.
out
.println(4*(1.0-1.0/3+1.0/5-1.0/7+1.0/9-1.0/11+1.0/13))
}
}
1.8
public
class
Test{
public
static
void
main(String[] args){
final
double
PI = 3.14
double
radius = 5.5
System.
out
.println(2 * radius * PI)
System.
out
.println(PI * radius * radius)
}
}
1.9
public
class
Test{
public
static
void
main(String[] args){
System.
out
.println(7.9 * 4.5)
System.
out
.println(2 * (7.9 + 4.5))
}
}
1.10
public
class
Test{
public
static
void
main(String[] args){
double
S = 14 / 1.6
double
T = 45 * 60 + 30
double
speed = S / T
System.
out
.println(speed)
}
}
1.11
public
class
Test{
public
static
void
main(String[] args){
int
BN = 312032486
//original person numbers
double
EveryYS,EveryYBP,EveryYDP,EveryYMP
EveryYS = 365 * 24 * 60 * 60
EveryYBP = EveryYS / 7
EveryYDP = EveryYS / 13
EveryYMP = EveryYS / 45
int
FirstYP,SecondYP,ThirdYP,FourthYP,FivthYP
FirstYP = (
int
)(BN + EveryYBP + EveryYMP - EveryYDP)
SecondYP = (
int
)(FirstYP + EveryYBP + EveryYMP - EveryYDP)
ThirdYP = (
int
)(SecondYP + EveryYBP + EveryYMP - EveryYDP)
FourthYP = (
int
)(ThirdYP + EveryYBP + EveryYMP - EveryYDP)
FivthYP = (
int
)(FourthYP + EveryYBP + EveryYMP - EveryYDP)
System.
out
.println(FirstYP)
System.
out
.println(SecondYP)
System.
out
.println(ThirdYP)
System.
out
.println(FourthYP)
System.
out
.println(FivthYP)
}
}
1.12
public
class
Test{
public
static
void
main(String[] args){
double
S = 24 * 1.6
double
T = (1 * 60 + 40) * 60 + 35
double
speed = S / T
System.
out
.println(speed)
}
}
1
.13
import
java.util.Scanner
public
class
Test{
public
static
void
main(String[] args){
Scanner input =
new
Scanner(System.
in
)
System.
out
.println(
"input a,b,c,d,e,f value please:"
)
double
a = input.nextDouble()
double
b = input.nextDouble()
double
c = input.nextDouble()
double
d = input.nextDouble()
double
e = input.nextDouble()
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如果是零基础，建议要么去学校学习，要么看视频，看书比较慢而且你很可能看不懂。书籍的话推荐以下：1. head first java
通俗易懂，重点突出的书，比较薄，适合初学者快速入门，缺点是编辑自以为幽默的加了很多不相干的段子在里面，废话太多。
2. Java A beginner's guide by Herbert Schildt
相比head first java，没有废话，语言精炼。
3. 官方的tutorial
免费的，在线阅读的，也不错。
4. 疯狂java讲义
如果英文不够好的话，可以考虑用这本书入门，中文世界里写的比较好的
5. Introduction to java programming by Y. Daniel Liang
梁勇这本书比较厚，讲算法比较多，如果你时间充足的话可以用这本书入门。
Java的书籍 推荐：经典之中的经典，①Java 核心技术 第八版
②java编程思想
搞懂了这两本书，你也就牛B了，很多工作了多年的程序员依然喜欢看这两本书，被奉为Java学习的圣经！
视频：韩顺平的 从入门到精通不错~
