判断变量类型

public class ClassType {
    public static void main(String[] args) {
        Integer i=0;
        String type = ifClassType(i);
        System.out.println(type);
    }
    
    public static String ifClassType(Object obj) {
        String type="";
        if(obj instanceof Integer){
            type = "Integer";
        }else if(obj instanceof Short){
            type = "Short";
        }else if(obj instanceof Double){
            type = "Double";
        }else if(obj instanceof Long){
            type = "Long";
        }else if(obj instanceof String){
            type = "String";
        }else if(obj instanceof Boolean){
            type = "Boolean";
        }else if(obj instanceof Character){
            type = "Character";
        }else if(obj instanceof T){//自定义类型
            type = "T";
        }
        return type;
    }
    class T{}
}