JavaSE8基础 StringBuffer toString 将其转为String对象

os ：windows7 x64
    jdk：jdk-8u131-windows-x64
    ide：Eclipse Oxygen Release (4.7.0)
    
    
code：

package jizuiku0;

public class Demo10 {
	public static void main(String[] args) {
		StringBuffer sb = new StringBuffer();
		sb.append("cnblog_");
		sb.append("jizuiku");

		String str = sb.toString();
		System.out.println(str);
	}
}

result：

sourceCode：

    @Override
    public synchronized String toString() {
        if (toStringCache == null) {
            toStringCache = Arrays.copyOfRange(value, 0, count);
        }
        return new String(toStringCache, true);
    }