String 包含 前缀包含

包含

语法

public boolean contains(CharSequence chars)

示例

String myStr = "abc";
System.out.println(myStr.contains("a")); //返回True
System.out.println(myStr.contains("b")); //返回True
System.out.println(myStr.contains("d")); //返回False

前缀包含

语法

public boolean startsWith(String prefix)
public boolean startsWith(String prefix, int toffset)

示例

String Str = new String("abcdef");

System.out.println(Str.startsWith("abc") ); //返回True

System.out.println(Str.startsWith("def") ); //返回False

System.out.println(Str.startsWith("def", 3) ); //返回True