201026:Math类常用方法-break和continue的区别

一. Math类常用方法大全

private void mathMethod(){
 
// Math.sqrt()//计算平方根 Math.cbrt()//计算立方根 Math.hypot(x,y)//计算 (x的平方+y的平方)的平方根
 
Log.d("TAG","Math.sqrt(16)----:"+Math.sqrt(16));//4.0
Log.d("TAG","Math.cbrt(8)----:"+Math.cbrt(8));//2.0
Log.d("TAG","Math.hypot(3,4)----:"+Math.hypot(3,4));//5.0
 
 
 
// Math.pow(a,b)//计算a的b次方 Math.exp(x)//计算e^x的值
 
Log.d("TAG","------------------------------------------");
Log.d("TAG","Math.pow(3,2)----:"+Math.pow(3,2));//9.0
Log.d("TAG","Math.exp(3)----:"+Math.exp(3));//20.085536923187668
 
 
 
 
//Math.max();//计算最大值 Math.min();//计算最小值
 
Log.d("TAG","------------------------------------------");
Log.d("TAG","Math.max(2.3,4.5)----:"+Math.max(7,15));//15
Log.d("TAG","Math.min(2.3,4.5)----:"+Math.min(2.3,4.5));//2.3
 
 
 
//Math.abs求绝对值
 
Log.d("TAG","------------------------------------------");
Log.d("TAG","Math.abs(-10.4)----:"+Math.abs(-10.4));//10.4
Log.d("TAG","Math.abs(10.1)----:"+Math.abs(10.1));//10.1
 
 
 
//Math.ceil天花板的意思，就是返回大的值
 
Log.d("TAG","------------------------------------------");
Log.d("TAG","Math.ceil(-10.1)----:"+Math.ceil(-10.1));//-10.0
Log.d("TAG","Math.ceil(10.7)----:"+Math.ceil(10.7));//11.0
Log.d("TAG","Math.ceil(-0.7)----:"+Math.ceil(-0.7));//-0.0
Log.d("TAG","Math.ceil(0.0)----:"+Math.ceil(0.0));//0.0
Log.d("TAG","Math.ceil(-0.0)----:"+Math.ceil(-0.0));//-0.0
Log.d("TAG","Math.ceil(-1.7)----:"+Math.ceil(-1.7));//-1.0
 
 
 
//Math.floor地板的意思，就是返回小的值
 
Log.d("TAG","------------------------------------------");
Log.d("TAG","Math.floor(-10.1)----:"+Math.floor(-10.1));//-11.0
Log.d("TAG","Math.floor(10.7)----:"+Math.floor(10.7));//10.0
Log.d("TAG","Math.floor(-0.7)----:"+Math.floor(-0.7));//-1.0
Log.d("TAG","Math.floor(0.0)----:"+Math.floor(0.0));//0.0
Log.d("TAG","Math.floor(-0.0)----:"+Math.floor(-0.0));//-0.0
 
 
 
//Math.random 取得一个大于或者等于0.0小于不等于1.0的随机数[0,1)
 
Log.d("TAG","------------------------------------------");
Log.d("TAG","Math.random()----:"+Math.random());//输出[0,1)间的随机数 0.8979626325354049
Log.d("TAG","Math.random()*100----:"+Math.random()*100);//输出[0,100)间的随机数 32.783762836248144
 
 
 
 
// Math.rint 四舍五入 返回double值
 
Log.d("TAG","------------------------------------------");
Log.d("TAG","Math.rint(10.1)----:"+Math.rint(10.1));//10.0
Log.d("TAG","Math.rint(10.7)----:"+Math.rint(10.7));//11.0
Log.d("TAG","Math.rint(-10.5)----:"+Math.rint(-10.5));//-10.0
Log.d("TAG","Math.rint(-10.51)----:"+Math.rint(-10.51));//-11.0
Log.d("TAG","Math.rint(-10.2)----:"+Math.rint(-10.2));//-10.0
Log.d("TAG","Math.rint(9)----:"+Math.rint(9));//9.0
 
 
 
//Math.round 四舍五入 float时返回int值，double时返回long值
 
Log.d("TAG","------------------------------------------");
Log.d("TAG","Math.round(10.1)----:"+Math.round(10.1));//10
Log.d("TAG","Math.round(10.7)----:"+Math.round(10.7));//11
Log.d("TAG","Math.round(-10.5)----:"+Math.round(-10.5));//-10
Log.d("TAG","Math.round(-10.51)----:"+Math.round(-10.51));//-11
Log.d("TAG","Math.round(-10.2)----:"+Math.round(-10.2));//-10
Log.d("TAG","Math.round(9)----:"+Math.round(9));//9
 
 
 
//Math.nextUp(a) 返回比a大一点点的浮点数
 
Log.d("TAG","------------------------------------------");
Log.d("TAG","Math.nextUp(1.2)----:"+Math.nextUp(1.2));//1.2000000000000002
 
 
//Math.nextDown(a) 返回比a小一点点的浮点数
 
Log.d("TAG","------------------------------------------");
Log.d("TAG","Math.nextDown(1.2)----:"+Math.nextDown(1.2));//1.1999999999999997
 
 
 
//Math.nextAfter(a,b) 返回(a,b)或(b,a)间与a相邻的浮点数 b可以比a小
 
Log.d("TAG","------------------------------------------");
Log.d("TAG","Math.nextAfter(1.2, 2.7)----:"+Math.nextAfter(1.2, 2.7));//1.2000000000000002
Log.d("TAG","Math.nextAfter(1.2, -1)----:"+Math.nextAfter(1.2, -1));//1.1999999999999997
 
}

二. break和continue的区别及其用法

break用于完全结束一个循环，跳出循环体，执行循环之后的代码。

break语句跳出当前循环。

break语句跳出外层循环

break语句不仅可以结束其所在的循环，还可以直接结束其外层循环。此时需要在break后紧跟一个标签，这个标签用于标识一个外层循环。Java中的标签就是一个紧跟英文冒号（:）的标识符。与其它语言不同的是，Java中的标签只有放在循环语句之前才有作用。

continue语句用于终止本次循环，接着开始下一次循环。

与break类似的，continue后也可紧跟一个标签，用于直接跳过标签所标识循环的当次循环的剩下语句，重新开始下一次循环。