Have properties: sideA, sideB sideC, has a constructor, a method: computing area getArea (), modify the three sides modifySides (double a, b double, double c), the number of constructor, the setter and getter methods to design

CodePudding user response:

Makes little sense to setter and getter methods

 
Package CSDN. 

Public class Triangle {

Private double sideA; 
Private double sideB; 
Private double sideC; 

//an equilateral triangle 
Public Triangle (double side) {
Enclosing sideA=side; 
Enclosing sideB=side; 
Enclosing sideC=side; 
} 

//isosceles triangle 
Public Triangle (double sideAB, double sideC) {
Enclosing sideA=sideAB; 
Enclosing sideB=sideAB; 
Enclosing sideC=sideC; 
} 

//regular triangle 
Public Triangle (double sideA, double sideB, double sideC) {
Enclosing modifySides (sideA sideB, sideC); 
} 

Private Boolean isTriangle () {
//set the trilateral of a triangle as a, b, c, a + b> C, a> C - b, b + c> A, b> A - a + c c> B, c> B - a 
Boolean isFlag=false; 
If ((enclosing sideA + enclosing sideB & gt; Enclosing sideC) & amp; & (this sideA & gt; (this. SideC - this. SideB)) 
& & (this. SideB + this. SideC & gt; Enclosing sideA) & amp; & (this sideB & gt; (this. SideA - this. SideC)) 
& & (this. SideA + this. SideC & gt; Enclosing sideB) & amp; & (this sideC & gt; (this. SideB - this. SideA))) {
IsFlag=true; 
} 
Return isFlag; 
} 

Public double getArea () {
Double area=1; 
If (isTriangle ()) {
//if it is a triangle, according to Helen formula to solve the area 
Double p=(enclosing sideA + enclosing sideB + enclosing sideC)/2; 
Area=math.h SQRT (p * (p - this. SideA) * (p - this. SideB) * (p - this. SideC)); 
} 
The return area; 
} 

Public void modifySides (double sideA, double sideB, double sideC) {
Enclosing sideA=sideA; 
Enclosing sideB=sideB; 
Enclosing sideC=sideC; 
} 

Public static void main (String [] args) {
Double a=30; 
Double b=40; 
Double c=50; 
Triangle ta=new Triangle (a, b, c); 
//ta.621 modifySides (a * 2 * 2 b, c * 2);//can uncomment look at running effect 
Double area=ta.621 getArea (); 
If (area!=1) 
System. The out. Println (area); 
The else {
System. Out.println (" unable to solve the triangle area!" ); 
} 
} 
}