java方法重载和参数类型自动提升方式

public class Test { 
    /**
     * 测试涉及基本类型的重载
     */
    public static void main(String[] args) {        
        System.out.print("char类型重载：");
        char x='x';
        f1(x);f2(x);f3(x);  
        System.out.print("byte类型重载：");
        byte y=0;
        f1(y);f2(y);f3(y);
        System.out.print("short类型重载：");
        short z=0;
        f1(z);f2(z);f3(z);f4(z);            
    }
    public static void f1(char x){System.out.print("f1(char)");}
    public static void f1(byte x){System.out.print("f1(byte)");}
    public static void f1(short x){System.out.print("f1(short)");}
    public static void f1(int x){System.out.print("f1(int)");}
    public static void f1(long x){System.out.print("f1(long)");}
    public static void f1(float x){System.out.print("f1(float)");}
    public static void f1(double x){System.out.print("f1(double)");}    
    
    public static void f2(short x){System.out.print("f2(short)");}
    public static void f2(int x){System.out.print("f2(int)");}
    public static void f2(long x){System.out.print("f2(long)");}
    public static void f2(float x){System.out.print("f2(float)");}
    public static void f2(double x){System.out.print("f2(double)");}    
    
    public static void f3(int x){System.out.print("f3(int)");}
    public static void f3(long x){System.out.print("f3(long)");}
    public static void f3(float x){System.out.print("f3(float)");}
    public static void f3(double x){System.out.print("f3(double)");}    
    public static void f4(long x){System.out.print("f4(long)");}
}