多个构造函数的写法

class Class1 { 
int i1; 
int i2; 
int i3; 
int i4; 
int i5; 
int i6; 

Class1() { } 

Class1(int i1, int i2) { 
i1 = i1; 
i2 = i2; 
} 

Class1(int i1, int i2, int i3, int i4) : this(i1, i2){  
i3 = i3; 
i4 = i4; 
} 

Class1(int i1, int i2, int i3, int i4, int i5, int i6): this(i1,i2,i3,i4) { 
i5 = i5; 
i6 = i6; 
} 
}