方法名必须相同
形参列表(类型，个数，顺序至少一样)必须不同，否则重定义
返回类型无要求
package chapter06.D6方法重载;
public class OverLoadExercise {
public static void main(String[] args) {
Methods method = new Methods();
method.m(10);//100
method.m(10,20);
method.m("征途");
}
}
class Methods{
public void m (int n){
System.out.println("平方="+(n*n));
}
public void m (int n1,int n2){
System.out.println("相乘="+(n1*n2));
}
public void m (String str){
System.out.println("传入的str="+str);
}
}
package chapter06.D6方法重载;
public class OverloadExercise2 {
public static void main(String[] args) {
Methods2 methods2 = new Methods2();
System.out.println(methods2.max(10,24));
System.out.println(methods2.max(10,24,21.4));//自动转化
}
}
class Methods2{
public int max(int n1,int n2){
return n1>n2?n1:n2;
}
public double max(double n1,double n2){
return n1>n2?n1:n2;
}
public double max(double n1,double n2,double n3){
double max1=n1>n2?n1:n2;
return max1>n3?max1:n3;
}
}
可变参数
package chapter06.D7可变参数;
public class VarParameter {
public static void main(String[] args) {
Method m = new Method();
System.out.println(m.sum(1,5,6));
}
}
class Method{
public int sum(int...nums){//可变参数，可接受多个int nums当做数组来使用
int res=0;
for (int i = 0; i < nums.length; i++) {
res+=nums[i];
}
return res;
}
}
package chapter06.D7可变参数;
public class VarParameterDetail {
public static void main(String[] args) {
int[]arr={1,2,3};
T t1 = new T();
t1.f1(arr);
}
}
class T{
public void f1(int...nums){//可变参数本质就是数组
System.out.println("长度="+ nums.length);
}
public void f2(String str,double...nums){//可变参数可以和普通类型参数一起放在形参列表，但可变参数要在后，并只能出现一次
System.out.println("长度="+ nums.length);
}
}
package chapter06.D7可变参数;
public class VarParameterExercise {
public static void main(String[] args) {
Method2 hm = new Method2();
System.out.println(hm.showScore("milan",90.1,80.0));
System.out.println(hm.showScore("terry",90.1,80.0,60.2,75.6));
}
}
class Method2{
public String showScore(String name,double...scores){
double totalScore=0;
for (int i = 0; i 
