I am using objective-c classes in swift2 , how i can implement delegate methods and bind that delegate

When you add objective-c classes in swift project, you'll be prompted for

'Create bridging header' -> click on 'create bridging header'. Now you can use objective-c code in your swift.

• In your Objective-C bridging header file, import every Objective-C header you want to expose to Swift.
• In Build Settings, in Swift Compiler - Code Generation, make sure the Objective-C Bridging Header build setting under has a path to the bridging header file. The path should be relative to your project, similar to the way your Info.plist path is specified in Build Settings. In most cases, you should not need to modify this setting.

For more detail refer

Modifying the solution as per your problem:

//Objective-c class
// Test.h
#import <Foundation/Foundation.h>

@protocol TestDelegate <NSObject>

- (void)testMethod;

@end

@interface Test : NSObject

@property (weak, nonatomic) id<TestDelegate> delegate;
@end

//Test.m
#import "Test.h"

@implementation Test
@synthesize delegate;

- (void)callDelegate
{
    [delegate testMethod];
}

@end

//Swift bridging header

//
//  Use this file to import your target's public headers that you would like to expose to Swift.
//

#import "Test.h"

//Swift class

class ViewController: UIViewController, TestDelegate {
.
.
.
    func testMethod() {
        print("Delegate");
    }
}