初心者向けJava8ラムダ演習1 ref: http://qiita.com/aya_eiya/items/798fb1d3f87491e9f6fb

Practice1.java

import java.util.List;
import java.util.ArrayList;

public class Practice1 {
  static public void main(String[] args) {
    List<String> helloWorld = new ArrayList<String>(3);
    helloWorld.add("Hello");
    helloWorld.add(" ");
    helloWorld.add("World");
    helloWorld.add("!");
    for (int i = 0; i < helloWorld.size(); i++) {
      System.out.print(helloWorld.get(i));
    }
  }
}

Practice2.java

public class Practice2 {
  static public void main(String[] args) {
    String sourceText = "this is an test script to read.";
    int i = 0;
    char c = sourceText.charAt(i);
    while (c != '.') {
      if (c > 'm') {
        System.out.print(Character.toUpperCase(c));
      } else {
        System.out.print(c);
      }
      c = sourceText.charAt(++i);
    }
    System.out.print(".\n");
  }
}

Practice2A.java

public class Practice2A {
  static private final int MAX = 1024;

  static public void main(String[] args) {
    String sourceText = "this is an test script to read.";
    int i = 0;
    char c = sourceText.charAt(i);
    int sum = c;
    while (sum < MAX) {
      if (c > 'm') {
        System.out.print(Character.toUpperCase(c));
      } else {
        System.out.print(c);
      }
      c = sourceText.charAt(++i);
      sum += c;
    }
    System.out.print("\n");
    if (sum >= MAX) {
      System.out.println("script stopped for MAX size limitation.");
    }
  }
}

Practice3.java

public class Practice2A {
  static private final int MAX = 1024;
  static public void main(String[] args){
    String sourceText = "this is an test script to read.";
    int i = 0;
    char c = sourceText.charAt(i);
    int sum = c;
    while(sum < MAX){
      if(c > 'm'){
          System.out.print(Character.toUpperCase(c));
      }else{
          System.out.print(c);
      }
      c = sourceText.charAt(++i);
      sum += c;
    }
    System.out.print("\n");
    if(sum >= MAX){
        System.out.println("script stopped for MAX size limitation.");
    }
  }
}