709. To Lower Case

 

Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.

 

Example 1:

Input: "Hello"
Output: "hello"

Example 2:

Input: "here"
Output: "here"

Example 3:

Input: "LOVELY"
Output: "lovely"

代码：

class Solution {
	public String toLowerCase(String str) {
		char[] mystring = str.toCharArray();
		String result="";
		for(char c:mystring) {
			if(c>='A'&&c<='Z') {
				c = (char) (c+32);
			}
			result+=c;
		}
		return result;
	    }
 
}

 

 

public String toLowerCase(String str) {
		StringBuilder builder = new StringBuilder();
		for(char c:str.toCharArray()) {
			if(c>='A'&&c<='Z') builder.append((char)(c+32));
		    else 	builder.append(c);
		}
		return builder.toString();
	    }
}

自带函数：

public String toLowerCase(String str) {
		return str.toLowerCase();
	    }