重載：方法名相同，參數列表不同，與返回值類型無關
重載的分類：
1，參數個數不同 ①，④，⑤，⑥；
2，參數類型不同 ①，②，③、 ⑤，⑥；
Ⅰ， 順序不同 ②，③；
public class overload {public static void main(String[] args) {int sum1 = add(10,20);System.out.println(sum1);double sum2 = add(10.1,20);System.out.println(sum2);double sum3 = add(10,20.2);System.out.println(sum3);double sum4 = add(10,20,30);System.out.println(sum4);int sum5 = add(10,20,30,40);System.out.println(sum5);double sum6 = add(10.1,20.2,30.3,40.4);System.out.println(sum6);}
① public static int add (int a,int b){return a + b ;}
② public static double add (double a,int b){return a + b ;}
③ public static double add (int a,double b){return a + b ;}
④ public static double add (int a,int b, int c){return a + b + c ;}
⑤ public static int add (int a,int b, int c, int d){return a + b + c + d ;}
⑥ public static double add (double a,double b, double c, double d){return a + b + c + d ;}
}
題目：比較兩個數據是否相等
參數類型分別為兩個int，兩個double類型，并在main方法中進行測試
public class bijiao {public static void main(String[] args) {boolean a = isEquals(10,20);System.out.println(a);boolean b = isEquals(20.2,20.2);System.out.println(b);}public static boolean isEquals(int a,int b){return a==b;}public static boolean isEquals(double a,double b){return a==b;}
}
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