软通公司培训的课件和习题里面有答案。。。

				package com.nine.java;
				
				public class StringValueof {
				
				
					public static void main(String[] args) {
						boolean b = false ;
						int i = 10 ;
						char c = 'c';
						Integer n  = new Integer(11);
						
						System.out.println(String.valueOf(b));
						System.out.println(String.valueOf(c));
						System.out.println(String.valueOf(i));
						System.out.println(String.valueOf(n));
						
					}
				
				}