?? interfnumlistdemo2.java
字號:
interface InterfNumList {
int getNextNum (); // 獲取下一個數的值
void setFirstNum(); // 初始化變量start、val
void pointNum(int x); // 設置某點的數值,即給val重新賦值。
}
class MultThree implements InterfNumList {
int start;
int val;
MultThree() {
start = 1;
val = 1;
}
public int getNextNum() {
val *= 3;
return val;
}
public void setFirstNum() {
start = 1;
val = 1;
}
public void pointNum(int x) {
start = x;
val = x;
}
}
class MultFour implements InterfNumList {
int start;
int val;
MultFour() {
start = 1;
val = 1;
}
public int getNextNum() {
val *= 4;
return val;
}
public void setFirstNum() {
start = 1;
val = 1;
}
public void pointNum(int x) {
start = x;
val = x;
}
}
class InterfNumListDemo2 {
public static void main(String args[]) {
MultThree threeOb = new MultThree();
MultFour fourOb= new MultFour();
InterfNumList ob;
for(int i=0; i < 4; i++) {
ob = threeOb;
System.out.println("Next MultThree value is " +
ob.getNextNum());
ob = fourOb;
System.out.println("Next MultFour value is " +
ob.getNextNum());
}
}
}
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