FIND OF POSITION any string in the string OTHER in J2SE

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String str1="Hello Java Hello Java Hello Java";
System.out.println(str1.indexOf("Java")); //6
System.out.println(str1.indexOf("Java",10)); //17
System.out.println(str1.lastIndexOf("Hello")); //22
System.out.println(str1.lastIndexOf("Hello",10)); //0