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luobin7
-java-
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/
chapter02
/
SetValueTest.java
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main
Breadcrumbs
-java-
/
chapter02
/
SetValueTest.java
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/*
测试运算符的使用2:赋值运算符
1. = +=、 -=、*=、 /=、%=
2. 说明:
① 当“=”两侧数据类型不一致时,可以使用自动类型转换或使用强制类型转换原则进行处理。
② 支持连续赋值。
③ +=、 -=、*=、 /=、%= 操作,不会改变变量本身的数据类型。
*/
class
SetValueTest
{
public
static
void
main
(
String
[]
args
) {
//***********************************
int
i
=
5
;
long
l
=
10
;
//自动类型提升
byte
b
= (
byte
)
i
;
//强制类型转换
//操作方式1:
int
a1
=
10
;
int
b1
=
10
;
//操作方式2:连续赋值
int
a2
;
int
b2
;
//或合并:int a2,b2;
a2
=
b2
=
10
;
System
.
out
.
println
(
a2
+
","
+
b2
);
//操作方式3:
//int a3 = 10;
//int b3 = 20;
int
a3
=
10
,
b3
=
20
;
System
.
out
.
println
(
a3
+
","
+
b3
);
//***********************************
//说明 += 的使用
int
m1
=
10
;
m1
+=
5
;
//类似于m1 = m1 + 5;
System
.
out
.
println
(
m1
);
byte
by1
=
10
;
by1
+=
5
;
//by1 = by1 + 5操作会编译报错。应该写为: by1 = (byte)(by1 + 5);
System
.
out
.
println
(
by1
);
int
m2
=
1
;
m2
*=
0.1
;
// m2 = (int)(m2 * 0.1)
System
.
out
.
println
(
m2
);
//练习1:如何实现变量的值增加2。
//方式1:
int
n1
=
10
;
n1
=
n1
+
2
;
//方式2:推荐
int
n2
=
10
;
n2
+=
2
;
//错误的写法:
//int n3 = 10;
//n3++++;
//练习2:如何实现变量的值增加1。
//方式1:
int
i1
=
10
;
i1
=
i1
+
1
;
//方式2:
int
i2
=
10
;
i2
+=
1
;
//方式3:推荐
int
i3
=
10
;
i3
++;
//++i3;
}
}
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