String与StringBuilder、String与char[]、String与int

1. String与char[]互相之间的转换

• String转char[]

char []c = str.toCharArray();

• char[]转String

String s = String.valueOf(c);

2.String与StringBuilder相互转换

• String转StrigBuilder

StringBuilder sb = new StringBuilder("anbsj");

• StrigBuilder转Strig

char a[] = builder.toString();

3. String与int互相之间的转换

• String转int

int num = Integer.parseInt(str);

• int转String

String s = String.valueOf(num);//任何数据类型都可以通过toString()转换成String类型。