1.绝对值
就变个符号
public static double abs(double a) {
return (a <= 0.0D) ? 0.0D - a : a;
}
public static float abs(float a) {
return (a <= 0.0F) ? 0.0F - a : a;
}
public static int abs(int a) {
return (a < 0) ? -a : a;
}
@IntrinsicCandidate
public static long abs(long a) {
return (a < 0) ? -a : a;
}
public static void main(String[] args) {
int i1 = 5;
int i2 = -5;
double d1 = 5.88;
double d2 =-5.88;
System.out.println("Math.abs(i2) = " + Math.abs(i2));
}
2.取整
1.向上取整 ceil
按自然顺序进行取整的
注意这里的返回值还是double
double d1 = 5.88;
double d2 =-5.88;
这里的结果是 >=d 也就是大于等于他的最小整数
System.out.println("正数向上取整：Math.ceil(d1) = " + Math.ceil(d1));
System.out.println("负数向上取整：Math.ceil(d2) = " + Math.ceil(d2));
System.out.println("Math.ceil(5.0) = " + Math.ceil(5.0));
System.out.println("Math.ceil(5.1) = " + Math.ceil(5.1));
2.向下取整
小于等于他的最大整数
System.out.println("Math.floor(d1) = " + Math.floor(d1));
System.out.println("Math.floor(d2) = " + Math.floor(d2));
文章来源：https://www.toymoban.com/news/detail-508904.html
3.四舍五入
double d1 = 5.88;
double d2 =-5.88;
double d3 = 5.11;
double d4 = -5.11;
System.out.println("Math.round(d1) = " + Math.round(d1));
System.out.println("Math.round(d2) = " + Math.round(d2));
System.out.println("Math.round(d3) = " + Math.round(d3));
System.out.println("Math.round(d4) = " + Math.round(d4));
文章来源地址https://www.toymoban.com/news/detail-508904.html
4.比大小
static int max(int a, int b) ->求两个数之间的较大值
static int min(int a, int b) ->求两个数之间的较小值
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