1，安装cdt

http://download.eclipse.org/tools/cdt/releases/10.2

cdt main feature

2，安装插件工具

https://download.eclipse.org/releases/photon

Eclipse Plug-in Develoment Environment

3，

public void setCompletionProposalAutoActivationCharacters(char[] activationSet) {
		//fCompletionAutoActivationCharacters = activationSet;
		String test="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
		char[] triggers=test.toCharArray();
		fCompletionAutoActivationCharacters = triggers;
	}

default:
				return activationChar>=97 && activationChar<=122?true:activationChar>=65 && activationChar<=90;
			}

链接地址：https://wenku.baidu.com/view/52b52039f9d6195f312b3169a45177232f60e438.html