Java中字符数组、String类、StringBuffer三者之间相互转换

StringBuffer buffer = newStringBuffer(“abcd”);
String str = buffer.toString();

StringBuffer buffer = newStringBuffer(“abcd”);
String str = newString(buffer); 

String str=“Hello World.”;
StringBuffer buffer = new StringBuffer(str);

String str=“Hello World.”; 
StringBuffer buffer = new StringBuffer();
buffer.append(str);

String str = “Hello World.”;// 创建一个String对象
char[] ch = str.toCharArray();// 再调用String对象的toCharArray函数转换成字

char[] data = {'a', 'b', 'c'};
String str = new String(data);

String.valueOf(char[] ch);

StringBuffer stringBuffer = new StringBuffer(“Hello World.”);
String str = stringBuffer.toString();// 先将StringBuffer对象转换成String对象
char[] ch = str.toCharArray();// 再调用String对象的toCharArray函数转换成字符数组

char[] data = {'H', 'e', 'l','l', 'o', 'd'};
String str = new String();//或者直接调用构造方法：String str = new String(data);
str = String.valueOf(data);//调用String类的valueOf函数将字符数组转换成String
StringBuffer buffer = new StringBuffer();
buffer = buffer.append(str);//调用append函数将String转换成Stringbuffer